Allows you to easily adjust your fuel inlection to match the requirements of performance parts Up-down push button adjustments(+ 30% to -20%) for fuel trim in the throttle position and RPM range Fuel trim value is on an LED display Tuner software uses the same TPS and RPM rows as Power Commander Can make individual adjustments to front and rear cylinders Just install the Twin Scan II+ and ride, then copy the AFR corrections to the PC link tuner software