ok i have a 03 cobra and i just did the 2.8 pulley on my car and the stock clutch is slipping when i shift at wot, the car has 74xxx and im 80% sure its a stock clutch, the mods are k&n air filter, 2.8 steeda pulley, upr catted x and magnaflow catback, clutch only slips when i shift otherwise it fine to drive and stuff