I had the same problem. noise did not get worse while slaloming. we were told by two mercedes mechanics that it was the dif. I jacked the car up, and put it on stands. ran the car in drive up to the speed that the noise was evident. i had to run the speed up, and then slowly let it decrease. after i got the noise, i held the throttle with a brick, and went under the car with a stethescope. it was easy to isolate the noise to the rear wheel bearing. hope this helps