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The ThunderMax ECM is fully adjustable with our ThunderMax tuning software or can be used just by loading a basemap
The rope detail keeps it classic
This harness is particularly beneficial for models with tight clearances
minimizing the need for extensive modifications
ThunderMax for 2025 - Up Softail® Models Stage 4 The ThunderMax ECM is fullyPart 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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