I am trading in my 2001 B5 S4 on a new Audi next week. I have cat-back MTM exhaust that I paid close to $2k for. See http://www.hoppenmotorsport.com/s427_1tuning.htm
The dealer isn't paying me any extra for the exhaust so I figure one of you guys can benefit from this. Make me an offer, we trade exhaust, you pay for the swap and we have a deal.
Feel free to email me or call 858-837-0403.
Take care, Nick