My 2006 Cayman S makes a sound that can only described as crushing a glass bottle when I turn the wheel all the way in either direction. The sound starts when the car moves and stops when the car stops. I think I actually feel a bumping in the steering wheel but I'm not sure (my be a mental thing). I took the car to the dealer two times. Both times they say there is nothing wrong. I was afraid it may be a wheel bearing. Since I participate in DE's I sure would hate to have a wheel bearing fail at Road Atlanta or VIR. Has any one else had this problem? If so what did you do to solve it?