This. TracKey is awesome in my book. Definitely worth the $400.ArizonaGT said:Picked up about 10hp & torque from 3000rpm to 5500rpm. No peak power or torque change. It's been speculated that most of the changes are related to part-throttle operation. The increased throttle sensitivity and engine braking are both noticeable and cool. Louder idle and engine overrun sound great.