723728 Fits 117CI Touring 2024 to Present and 121CI Vvt Touring 202

The ThunderMax EFI system is widely regarded as one of the most powerful self-tuning fuel management tools available for Harley-Davidson Touring models. This wide-band, closed-loop system replaces the stock ECM to provide real-time adjustments to your air-fuel ratio, regardless of changes in altitude, temperature, or fuel quality. It is designed to work with any performance level, from stock bikes to those with high-flow exhausts and air cleaners. You will experience significantly improved throttle response, easier starting, and a smoother-running engine. It also allows for idle speed adjustment to help your motor run cooler in traffic. Note that this system requires 18mm exhaust sensor bungs, which were standard on 2007 to 2009 models or can be added to later pipes.