Thunder Heart Performance ECMS with Integral Auto Tune System - 309-591

ThunderMax ECM with Auto-Tune module mounts conveniently in place of the factory ECM and plugs in to the existing harness
Utilizes wide-band O2 sensors that work as a closed-loop control system to continuously self-adjust and properly tune the motorcycle's air/ fuel ratio for all riding conditions
Easy installation: replace the factory ECM, install new O2 sensors and harness, load the correct map for your bike and ride
Includes ThunderMax ECM with Auto-Tune module, plug-in harness and two wide-band sensors, TMax software and communication USB cable, Quick-Start Easy Install and Comprehensive User's Manual, technical support and free software and updates
Hundreds of maps available to download for your bike (based on model, engine size, exhaust system air cleaner, pistons, cams, etc.) - load the map of your choice and the integral auto-tune will do the rest
Improves throttle response, exhaust sound and driveability
Does not require dyno tuning
Rider can adjust idle speed, rev limit and speedometer calibration