{"title":"TUNERS","description":"\u003cp\u003eALL TMAXX TUNERS\u003c\/p\u003e","products":[{"product_id":"thundermax-2021-up-touring®-models-w-o-center-cool-motor","title":"ThunderMax 2021-Up Touring® Models (w\/o Center Cool Motor)","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-591\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e*Excludes 2023.5 - Up Center Cooled Motors - see Part Number: 309-605\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-591 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eThe ThunderMax 309-591 also features knock correction for timing adjustment, adding another layer of performance by adapting ignition timing on the fly. And unlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-591 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46126285389881,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/309-591_LS_1x1-2_900x_baa6d368-dc5f-4432-be89-1c590bc2728c.webp?v=1782860533"},{"product_id":"thundermax-2017-2020-touring®-models","title":"ThunderMax 2017-2020 Touring® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-588\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eWorks with or without RDRS (Traction Control) \u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-588 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eThe ThunderMax 309-588 also features knock correction for timing adjustment, adding another layer of performance by adapting ignition timing on the fly. And unlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-588 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134806118457,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/309-588_1x1-3_900x_c8377397-adfb-4f01-b992-befa95a769d7.jpg?v=1782861054"},{"product_id":"thundermax-for-08-13-touring®-models","title":"ThunderMax for 08-13 Touring® Models","description":"\u003cp\u003e\u003cspan\u003ePart Number: 309-362\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-362 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/p\u003e\n\u003cp\u003e At its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/p\u003e\n\u003cp\u003e Unlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/p\u003e\n\u003cp\u003e Riders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/p\u003e\n\u003cp\u003e The result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-362 is engineered, built, and supported in the USA.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/p\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134812508217,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/309-361_clipped_2025_900x_0181408a-85eb-4a23-aa8f-6c0a1f8bda05.webp?v=1782861347"},{"product_id":"thundermax-for-02-07-touring®-models","title":"ThunderMax for 02-07 Touring® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-460\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-460 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-460 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134823419961,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/309-460_LS_1x1-2_900x_7476a4fb-9af1-4631-ba52-d747c049396d.webp?v=1782861632"},{"product_id":"thundermax-2014-2016-touring®-models","title":"ThunderMax 2014-2016 Touring® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-562\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-562 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-562 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134828793913,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/309-562_LS_1x1_900x_273f83c4-2139-4344-8de0-15576e770fc9.webp?v=1782861841"},{"product_id":"thundermax-for-2021-2024-softail®-models","title":"ThunderMax for 2021 - 2024 Softail® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-592\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNote: The ThunderMax 309-592 kit uses the same ECM as part number 309-591 but includes a specially designed ECM caddy for Softail fitment, making installation clean and secure for Softail models.\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003eThunderMax is an award-winning, performance ECM designed specifically for EFI-equipped Harley-Davidson® motorcycles. This advanced, stand-alone tuning system uses proprietary AutoTune technology with wide-band oxygen sensors to deliver unmatched performance, rideability, and adaptability.\u003c\/h6\u003e\n\u003ch6\u003eThe ThunderMax ECM comes fully assembled, ready to install, with no wire-cutting or splicing required. Simply replace the factory ECM and oxygen sensors, load a base map, and ride. Installation is quick, and the system immediately begins tuning itself to your bike.\u003c\/h6\u003e\n\u003ch6\u003eWith built-in knock control for timing adjustment, ThunderMax offers precise spark management in real time. It retains full factory functionality and works seamlessly with factory systems. Wide-band O₂ sensors continuously read the air\/fuel ratio, automatically making live adjustments across every throttle position and RPM range. No dyno is required, and once you key off, all changes are instantly written to the ECM.\u003c\/h6\u003e\n\u003ch6\u003eThe ThunderMax software is\u003cspan\u003e \u003c\/span\u003e\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download\u003c\/a\u003e\u003c\/span\u003e\u003cspan\u003e \u003c\/span\u003efrom our website and provides full access to tuning tools, diagnostics, and data collection. Riders can monitor, record, and examine critical information such as engine temperature, RPM history, diagnostic codes, and more.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e\u003cb\u003eNotice:\u003c\/b\u003e ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134832103481,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/AAA.webp?v=1782862010"},{"product_id":"thundermax-for-2004-2011-dyna®-models","title":"ThunderMax for 2004 - 2011 Dyna® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-485\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6 class=\"p1\"\u003e\u003cspan\u003e\u003cspan class=\"s1\"\u003eNote:\u003c\/span\u003e The ThunderMax 309-485 uses an ECM case marked \u003cspan class=\"s1\"\u003e309-460\u003c\/span\u003e, but the 309-485 kit is supplied with a \u003cspan class=\"s1\"\u003epigtail harness\u003c\/span\u003e and a \u003cspan class=\"s1\"\u003e90-degree USB linking cable\u003c\/span\u003e for added installation flexibility.\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-485 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003efree to download from our website\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-485 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134845145145,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/SS.webp?v=1782862403"},{"product_id":"thundermax-for-2001-2010-softail®-models","title":"ThunderMax for 2001 - 2010 Softail® Models","description":"\u003cdiv class=\"productdesc\"\u003e\n\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-460\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-460 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-460 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134847668281,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/QQQ.webp?v=1782862515"},{"product_id":"thundermax-for-99-01-magnetti-marelli®-models","title":"ThunderMax for 99 - 01 Magnetti Marelli® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cstrong\u003ePN: 309-313\u003c\/strong\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e**The ThunderMax 309-312 and 309-313 ECMs are designed exclusively for Magnetti Marelli–equipped EFI Harley-Davidson® models. These units will not function on bikes that have been converted to Delphi EFI. If your motorcycle has been converted to Delphi, you will need ThunderMax part number 309-314, available through Zipper’s Performance.\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. The 309-313 is designed specifically for Magnetti Marelli–equipped EFI models from 1999–2001, giving these classics modern tuning technology without sacrificing reliability. The kit arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eThis kit also includes a speed sensor wire and sensor harness, ensuring proper integration with the Magnetti Marelli system and a clean, reliable installation.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you keep the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003e\u003cspan\u003efree to download from our website\u003c\/span\u003e\u003c\/a\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Built for Magnetti Marelli–equipped Harleys. Engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134863626297,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/WW.webp?v=1782862915"},{"product_id":"thundermax-for-2012-2017-dyna®-models","title":"ThunderMax for 2012 - 2017 Dyna® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-382\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-382 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.Riders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eThe system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.The result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-382 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e\u003cb\u003eNotice:\u003c\/b\u003e ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134868934713,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/EE.webp?v=1782863011"},{"product_id":"thundermax-for-2012-2015-softail®-models","title":"ThunderMax for 2012 - 2015 Softail® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-383\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-383 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-383 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134871785529,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/DD.webp?v=1782863118"},{"product_id":"thundermax-for-2002-2017-v-rod®-models","title":"ThunderMax for 2002 - 2017 V-Rod® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-466\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-466 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-466 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e\u003cstrong\u003eNotice:\u003c\/strong\u003e ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134874603577,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/FFF.webp?v=1782863219"},{"product_id":"thundermax-for-2025-up-softail®-models","title":"ThunderMax for 2025 - Up Softail® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-606\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-606 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eThe ThunderMax 309-606 also features knock correction for timing adjustment, adding another layer of performance by adapting ignition timing on the fly. Unlike other aftermarket tuners, ThunderMax fully supports factory features, so your ride modes, Wi-Fi, and navigation all continue to work seamlessly. This ECM is compatible with both VVT and non-VVT bikes.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-606 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134880436281,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/GG.webp?v=1782863352"},{"product_id":"thundermax-for-2014-2022-sportster®-models","title":"ThunderMax for 2014 - 2022 Sportster® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-382\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-382 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.Riders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration.\u003c\/h6\u003e\n\u003ch6 class=\"productdesc\"\u003eThe system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.The result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-382 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e\u003cb\u003eNotice:\u003c\/b\u003e ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134886858809,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/HH.webp?v=1782863552"},{"product_id":"thundermax-for-95-98-magnetti-marelli®-models","title":"ThunderMax for 95 - 98 Magnetti Marelli® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cstrong\u003ePart Number: 309-312\u003c\/strong\u003e\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eThe ThunderMax 309-312 and 309-313 ECMs are designed exclusively for Magnetti Marelli–equipped EFI Harley-Davidson® models. These units will not function on bikes that have been converted to Delphi EFI. If your motorcycle has been converted to Delphi, you will need ThunderMax part number 309-314, available through Zipper’s Performance.\u003c\/span\u003e\u003c\/h6\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. The 309-312 is designed specifically for Magnetti Marelli–equipped EFI models from 1995–1998, bringing modern tuning control and reliability to these early-generation EFI bikes. The kit arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThis kit also includes a speed harness, tip sensor, and harness, ensuring proper integration with the Magnetti Marelli system for a complete, reliable installation.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you keep the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Built for Magnetti Marelli–equipped Harleys, the ThunderMax 309-312 keeps these mid-’90s EFI models running strong and performing better than ever. Engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134894886969,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/XXX.webp?v=1782863741"},{"product_id":"thundermax-for-2016-2017-dyna-lowrider-s®-models","title":"ThunderMax for 2016 - 2017 Dyna LowRider S® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-563\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-563 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-563 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134897377337,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/C.webp?v=1782863843"},{"product_id":"thundermax-2007-2009-sportster®-models","title":"ThunderMax 2007 - 2009 Sportster® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-460\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-460 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-460 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003e\u003cb\u003eNotice:\u003c\/b\u003e ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134901014585,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/VVV.webp?v=1782863944"},{"product_id":"thundermax-for-2010-2013-sportster®-models","title":"ThunderMax for 2010 - 2013 Sportster® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-485\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6 class=\"p1\"\u003e\u003cspan\u003e\u003cspan class=\"s1\"\u003eNote:\u003c\/span\u003e The ThunderMax 309-485 uses an ECM case marked \u003cspan class=\"s1\"\u003e309-460\u003c\/span\u003e, but the 309-485 kit is supplied with a \u003cspan class=\"s1\"\u003epigtail harness\u003c\/span\u003e and a \u003cspan class=\"s1\"\u003e90-degree USB linking cable\u003c\/span\u003e for added installation flexibility.\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-485 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-485 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134903570489,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/BBB.webp?v=1782864058"},{"product_id":"thundermax-for-2016-2017-softail®-models","title":"ThunderMax for 2016 - 2017 Softail® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-563\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-563 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-563 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134905897017,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/N.webp?v=1782864154"},{"product_id":"thundermax-for-2011-softail®-models","title":"ThunderMax for 2011 Softail® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-361\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-361 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003efree to download from our website\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-361 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134908780601,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/MMM.webp?v=1782864248"},{"product_id":"thundermax-for-2011-2013-cvo-softail®-models","title":"ThunderMax for 2011 - 2013 CVO Softail® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-363\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-363 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003efree to download from our website\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-363 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134914711609,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/JJJ.webp?v=1782864395"},{"product_id":"thundermax-for-2014-2015-cvo-softail®-models","title":"ThunderMax for 2014 - 2015 CVO Softail® Models","description":"\u003ch6\u003e\u003cspan\u003ePart Number: 309-563\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-563 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\" title=\"Software Download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-563 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134915268665,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/KKK.webp?v=1782864527"},{"product_id":"thundermax-for-2008-2012-xr1200®-models","title":"ThunderMax for 2008 - 2012 XR1200® Models","description":"\u003ch6 class=\"productcode\"\u003e\u003cspan\u003ePart Number: 309-485\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6 class=\"p1\"\u003e\u003cspan\u003e\u003cspan class=\"s1\"\u003eNote:\u003c\/span\u003e The ThunderMax 309-485 uses an ECM case marked \u003cspan class=\"s1\"\u003e309-460\u003c\/span\u003e, but the 309-485 kit is supplied with a \u003cspan class=\"s1\"\u003epigtail harness\u003c\/span\u003e and a \u003cspan class=\"s1\"\u003e90-degree USB linking cable\u003c\/span\u003e for added installation flexibility.\u003c\/span\u003e\u003c\/h6\u003e\n\u003cdiv class=\"productdesc\"\u003e\n\u003ch6\u003eThunderMax is a performance-driven, award-winning ECM built exclusively for EFI-equipped Harley-Davidson® motorcycles. Designed as a stand-alone replacement for the factory ECM, the 309-485 arrives fully assembled with wide-band oxygen sensors, plug-in harness, AutoTune module, USB communication cable, and everything you need for a straightforward install—no wire-cutting, splicing, or dyno required.\u003c\/h6\u003e\n\u003ch6\u003eAt its core, ThunderMax uses proprietary AutoTune technology and a closed-loop control system to continuously read, adjust, and perfect your air\/fuel ratio in real time. With fueling points mapped every 1.5° of throttle and every 256 RPM, the system delivers unmatched precision for smooth, consistent performance in all riding conditions. A built-in barometric sensor accounts for altitude and ambient air changes automatically—just load the map that matches your build and ride.\u003c\/h6\u003e\n\u003ch6\u003eUnlike other aftermarket tuners, ThunderMax fully supports factory functions, so you don’t lose the stock conveniences your Harley came with.\u003c\/h6\u003e\n\u003ch6\u003eRiders get complete flexibility: run a basemap and let AutoTune handle the rest, or dive into the ThunderMax software—\u003cspan\u003e\u003ca title=\"Software Download\" href=\"https:\/\/store.thunder-max.com\/pages\/new-software-download\"\u003efree to download from our website\u003c\/a\u003e\u003c\/span\u003e—to fine-tune AFR maps, ignition timing, startup fuel, idle speed, rev limits, and speedometer calibration. The system also offers robust data collection and diagnostic capabilities, letting you log, monitor, and analyze critical engine metrics for deeper insight into performance.\u003c\/h6\u003e\n\u003ch6\u003eThe result? Sharper throttle response, stronger rideability, and that deep, tuned exhaust note that makes the bike yours. Compatible with high-performance cams, turbo, nitrous, and supercharger applications, ThunderMax 309-485 is engineered, built, and supported in the USA.\u003c\/h6\u003e\n\u003ch6\u003e\u003cspan\u003eNotice: ThunderMax ECMs utilize 18mm O₂ sensors. Factory exhaust systems are equipped with 12mm ports; however, nearly all aftermarket exhaust systems are manufactured with 18mm ports. If using a factory exhaust, you may weld in 18mm bungs. Bungs are not included.\u003c\/span\u003e\u003c\/h6\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Square One Performance","offers":[{"title":"Default Title","offer_id":46134916644921,"sku":null,"price":1088.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/files\/LLL.webp?v=1782864648"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0680\/3033\/2985\/collections\/Tmax_logo_22_720x_3a0643d9-d138-4cbb-ab24-a2934b3a5812.webp?v=1782862702","url":"https:\/\/square1performance.shop\/collections\/tuners.oembed","provider":"Square One Performance","version":"1.0","type":"link"}