4-year old 1.8T, no chip, 62k miles. Hi all, Every now and then I get an exhaust pop, not bang, but loud enough to hear with windows down. Sounds like I ran over a short bit of plank or something. Also, when sitting at lights, with car cold or hot, idle causes car to jerk enough to easily feel it through seat. Thirdly, exhaust seems to rattle when accelerating - e.g. lots of gas in a high gear - sounds like a quiet rasping sound. Not harsh, but like the engine wants to do more but isn't for some reason.. hard to describe. It didn't do this about 2000 miles ago. Gambba posted a great ETKA image of the turbo (on a different forum site), saying I should check a gasket that could be loose, but I'm not familiar/comfortable enough to locate it and check. Do these 3 symptoms combine to point to anything in particular? Bear in mind I'm at 62k miles and have not had timing belt done. I intend to do that pretty soon. In 3k miles or when water pump starts playing up. Whichever comes first. I'm thinking maybe jerky idle could be related to timing belt getting tired? It's the exhaust rasp that's bugging me the most though. I don't get it when accelerating in a lower gear - only when starting to accelerate with a low engine speed. Could it be cat breaking up? I don't hear it when in neutral - revving engine in neutral sounds fine. It's a subtle sound, but annoying. Any comments much appreciated.