What kind of exhaust system do you want? Are you staying with the single exhaust and just replacing the muffler for a bit more sound, or are you going to put some kind of dual setup on the car? I've had some smaller GM cars over the years with the 60 degree V6 in them (not the same as the 3.8 or 4.3, I know), with different exhaust systems on them, and they can sound pretty good. Right now I have a '96 Pontiac Trans Sport with the 3400 V6 in it, and I've had a 2 1/2" cat back exhaust put on it with a single Magnaflow muffler, and it sounds pretty good. Its a bit loud under acceleration, but not too bad, and at cruise or idle its almost as quiet as stock. Just my $0.02. Good luck with yours.