Im totally new to audi's,(and this forum) so i know about as much as a mango right now. I recently got a hold of a 1999 a6 2.8 quattro and of course, Id like my car to sound a little better, maybe be a little faster. My question is, is it true that exhaust systems made for s4's, and normal a4's fit the a6? Ive heard that they do, and that they don't, so i was hoping to get some clarification on this. Thank you very much in advance for any advice