I have recently purchased an E36. I haven't been able to get much track time, but the little time I have had out I've picked up a low click/thump noise in the rear. It speeds up and slows with the car. I do not hear or feel a vibration at speed. I only had it to about 5k rpm due to new engine break in. I had someone check the tires for debris and found nothing. They suggested it may be a CV joint. Any standard proceudres to diagnose problem? I believe the noise is coming from the right rear. weird mechanical noises combined with high speed bother me, go figure.