Hi All. Hope someone can help.I have started to hear an annoying rattle from my car which sounds like a heat shield vibrating on the exhaust.? It only happens when I take my foot off the accelerator.It has been in to my local Audi dealer and they seem to think there isn,t a problem . It is a 2.0 quattro 220 bhp Bul engine 2006 reg. Has anyone had this problem?