the clutch was installed by Boosted Performance. I planned on nitrous thats why i chose a stage 3, i mean i make right over 330 hp and 360 ft. lb. tq on pump gas but i only spray on 106 or better, and with 106 the car makes about 375 hp and right over 4oo ft lb tq. I'm presently using a 150 shot in the motor....runs fine as long as i dont power shift...