I am considering doing some exhaust work now. I _HATE_ loud exhaust, so no greedy or a'pexi catback for me. I am going to keep the OE muffler, but definately going for Cattman Y pipe, and most likely Courtesy B pipe, maybe a R/T cat. Anyway, I know that my 97 has an O2 sensor behind the cat, and there was some issues regarding the non post cat O2 sensor equipped vehicles with the Courtesy B pipe. Does the Courtesy B pipe bolt up with no sweat, or is that "extension" piece going to present a problem? I do not want to do any welding or cutting whatsoever.

He has done a lot of work on this topic. His page is an excellent place to read about it.
Good luck,

http://grprete.jnet.net/Greg's%20Gar...Pipe%20Fix.htm

The Courtesy B-Pipe will bolt up directly to your car without any welding or cutting. It bolts directly to the "weird extension piece". If your car has the O2 behind the cat then it already has the weird extension piece.