ThunderMax® is complete system designed specifically for EFI equipped Harley Davidson® motorcycles.

This highly advanced, stand-alone tuning system utilizes proprietary AutoTune technology specifically designed to interface with wide-band oxygen sensors to correct abnormal A/F readings over a wide range of throttle positions and RPM ranges to prevent over rich or lean conditions.

ThunderMax® is made in the USA and comes assembled, no wire-cutting or splicing required to install. Replaces factory ECM and narrow band oxygen sensors.

*Supports RDRS function on 2019-2022 models.

No RDRS function for Tri-Glide Models- 309-588 fitment only for Tri-Glide 2017-2018 models only.

Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

Weight 3 lbs