> My cat is in decent shape, and I would like to keep it that way. So > I want a spare cat to modify for track use. I am hoping that a 5000t > cat will fit, as they can be found in the junkyard fairly cheaply. Nope ... only the Ur-Q used 65mm exhaust tubing and the cat is unique to the car. You don't even want to know how proud Audi is of them... :^( JG