Thats right my underdrive pulley is installed. It feels like she accelerates a lot quicker and a little more responsive to the throttle. The instructions say I wont get ther full potential out of her until a week so the computer can recalibrate. The only bad thing is the belts squeal when it starts up. Is it because they are new belts? Or maybe too tight/loose? They arent loose as far as I can tell...