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Ships within 48 hours · Estimated delivery Aug 15 - Aug 20
The rope detail keeps it classic
minimizing the need for extensive modifications
ensure correct signal inputs and outputs
The ThunderMax ECM is fully adjustable with our ThunderMax tuning software or can be used just by loading a basemap
once you key off the changes are written
ThunderMax for 2025 - Up Softail® Models Stage 4 The rope detail keeps itPart Number: 309 606 The ThunderMax Performance ECM is a complete replacement engine management system engineered to unlock your Harley Davidsons full potential. Featuring industry leading wide band AutoTune technology, ThunderMax continuously optimizes fuel delivery for your exact combination of components, delivering smoother throttle response, improved rideability, and reliable performance mile after mile. Proudly designed, manufactured, and
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