ThunderMax EFI

Since 2003, the ThunderMax team has been 100% focused on developing products that improve the performance and overall rider experience for EFI equipped Harley Davidson motorcycles.  The award-winning ThunderMax is a complete, standalone performance ECM which simply is the most powerful, advanced, and user friendly electronic fuel management system available on the market today.

ThunderMax is a closed-loop system with proprietary AutoTune Technology that utilizes a high resolution Alpha/N-based system and wide-band oxygen sensors in order to provide the most versatile and precision tuning available. The factory ECM is completely and cleanly replaced with the ThunderMax utilizing the original location and connection to the H-D harness. Increased throttle response and "seat of the pants" torque coupled with a smoother, cooler running engine gives the rider utmost satisfaction of performance and rideability.