or could this be a sign the rear end is going out? I've ragged my trans am's rear before and it didn't sound like this but hey its a mercedes, things are different. I killed 3 diffs in that car lol 450hp with a 3600 stall converter = dead diff ha ha ha (poor stock 10 bolt). One day the mercedes will be just as fast, just smoother. Anybody have a 3.2 liter out there? M104 with harness and computer. I love the smoothness of the 2.6 but I wish it would pick up better around 3500 and above. One day that will be next switch. For now the 2.6 with a heavily shaved and extensively ported polished head moves good for now Now if I just could figure out what this noise is. Could I post a video clip on here? Maybe that way you guys could hear what I hear. I'm no stranger to hot rodding, problem solving, and just straight up tweaking but I can't figure it out.