Any insight or anyone with a similar issue manage to fix it. 2006 2.0TDi 140ps sportback quattro There could be two separate issues here but I think it's related 1) more prominent when the engine is cold, there is a nasty rattle/vibration coming from the rear when tootling around with low revs in a high gear when accelerating. For example in 4th, doing about 35 ish. i though it was an exhaust mount at first. It's a dead ringer for the exhausts rattling against something. But all the mounts are perfect, in fact the full system is in excellent shape. I then wondered about a baffle coming loose but underhand this is almost impossible from other posts I've read... 2) traveling at speed, say motorway cruising at 80, it sounds like I've got an 8inch big bore on. The resonance in the cabin is loud, accelerate to 85 and is almost gone. Take to foot off the gas and instant silence, foot back on and I have to almost shout for a passages to hear. It's worst when the engines revs are anywhere from 2k to 2.5k with the gas on. So I though baffles again? Could it be the cat? There are no leaks, down pipe is sound, really boggled. im told my model doesn't have a particulate filter either. any ideas?