I just had my car on the lift, and the two wheels had play. The shop tightened the center lug on the front, it worked. The rear however, did not. It apears to me to have a fair amount of play, enough that you can rock the wheel back and forth some on the lift. The car has floating calipers, upgraded challenge wheels, etc. Every so often there is a urrrraaaaeraaurraaa sound from that wheel. I have hoped it is the racing brakes. This noise will not occure during braking, only under power. Any one experienced with this? Looks like I will be replacing some parts soon. Hopefully not a hub. Ever heard of a rear wheel coming off under way? I have a fantastic shop to repair it, just wondering how frequently this occurs on 348s.