I get some mild clutch chatter on the rare occasion. Usually if the car has been running for a while and it happens only when I accel and clutch in a very specific way, usually when I'm trying to move the car a short distance very slowly like into a tight parking spot or something. When it happens I can avoid it again but adjusting my technique. Is a little bit once in a while anything to worry about? My e34m5 always had a tiny bit too but it never got worse in the 4 years I owned it. Until recently I didn't even know that chatter could be a symptom of something. I just thought it was normal for a bad launch.