Andy, What you've described doesn't sound like a blown exhaust gasket or a muffler problem. I really don't think a one time shot at burning a little rubber ( jeez can you do that with a DeLorean? ) would cause major problems. Worst case scenario is something happened to the clutch but I'd suggest driving it for a while to let any "guilt" related issues subside. I don't mean to make this sound like you're imagining things. I think you're like me in that you are working on the car yourself and looking very closely at results. When you push the car to a level that you conceive as possibly causing damage....well, sometimes you react by being over critical and start to look for problems. If there is a problem I'd look closely at various engine and drive train components to see if anything may be touching some part of the car and possibly be causing the harmonic sound you hear. The sounds you describe don't sound as much like a mechanical problem as something resonating through the car. You say you only really notice it at idle speeds and it seems like a low resonance which doesn't fit a mechanical problem. One would assume problematical mechanical sounds would increase along with the everything else as the car accelerates. Bruce Benson To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/