I got a 01 Gt and i put some underdrive pullies from BBk witch were cheap and i did feel the differance. But ive had them now for about 10k miles and the car will not cool down ive changed the coolant, thermostant, ive flushed the system, changed the water pump but, the car always wants to overheat. I took them off and inspected each pulley and each one and groves in it like the belt was eating at the pullies. Man im gonna get me a set of steedas cuz the bbk Aluminum are CRAAAAP!