Accel self learning fuel injection tuner module automatically compensates for changing loads, weather conditions and altitude while you ride. Easy installation using direct plug-in connections to factory throttle position sensor, crank position sensor and oxygen sensors. Automatic recalibration optimizes for modifications such as exhaust pipes, intake, air cleaners, cams, etc. Eliminates the bang and pop associated with mis-programmed ECU due to intake and exhaust modifications and no need to re-flash the factory ECU, simply plug it in and ride.