Zippers ThunderMax ECM with Auto-Tune Closed Loop System 309365 ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs in to the existing harness With the Auto-Tune, AFR tuning for component and exhaust changes are self-adjusting simply install, download a map and ride while Auto-Tune maintains target AFR in all conditions Includes ThunderMax ECM and Auto-Tune Module, plug-in harness and two wide band sensors, SmartLink Software and