The car has 80,000 miles on it..everything but the upgraded wheels, volo performance chip, and the speed booster is stock... Seems, off the original the rivits on the pulley comes apart, and this has happened to the original and the other one I purchased off Ebay. The one I bought off Ebay was suspect though, because it was making noises even before I put it on..Don't really know what causes this to happen, car is lightly driven..Tires are rear 295x35x19 rear..and 225x40x18 fronts, on custom Rims. Please if you can help me information wise, I am willing to listen..