This is the performance ECU upgrade that is direct drop in to the 2007 ST3 bike.
Bought new and used with my ST3 until I sold the bike.
Keeps the idle rich and engine running smooth with no hesitation or stutter from lean runs
Consistent smooth engine run at cold start or after warm up.
Allows for upgraded high flow pipe and intakes
Reduce abrupt throttle "on/off" feel when corning