Going back to stock exhaust, actually just traded the car in on a 2001 Audi S4, going back to school, needed something cheaper.
Rear seats are easy if you actually know what you are doing. I can do it in 2 minutes now.
I have directions online for the NAV-TV install. Go to my link in my sig file.
Pictures of the Supersprint exhaust are at
http://www.cjonesy.com/m5/exhaust.htm
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01 Carbon Black M5
Supersprint catback, x-pipe, Dinan S3 suspension, BBS RCs, NAV-TV, Dinan S2 software. Slotted rotors. Pics and other goodies at
http://www.cjonesy.com/m5