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Ships within 48 hours · Estimated delivery Aug 17 - Aug 22
This harness is particularly beneficial for models with tight clearances
The rope detail keeps it classic
Notice: ThunderMax ECMs utilize 18mm O₂ sensors
real time feedback to the ECM
ThunderMax for 2025 - Up Softail® Models Stage 4 This harness is particularly beneficialPart 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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