| I think I am going to take your advice and start with the wheels/tires. I've been researching prices on new rear tires for a few days now because they are pretty much ready to be replaced. So I will also get a front/rear alignment and make sure they balance all everything for me. That way if it turns out not to be the problem, at least all that is ruled out of the equation.
I always wondered what would cause something to shake only "sometimes", I guess there are a lot of variables when it comes to wheels/tires like speed/temperature/psi/etc.. so I'm sure all that lining up a certain way has something to do with the "sometimes".
I really appreciate the response! For some reason right off the bat my mind always wants to believe that something is broken.
EDIT: oh and yes I am staggered.. I never realized how hungry for rubber the rear end of an m3 is.
Last edited by mmerlina; 02-01-2013 at 06:37 AM.