Flowmaster's suck.

Pacesetter's have their own downpipe, so not sure how you have a 3" ZZP one...do you have true dual exhaust?

Catted WBS Store Headers, with a full dynomax catback sounded good on an '04 GTP...quiet is the key, unless you have some dumb small pulley, monster bird catching hair dryer, or some mega pointless huge lift cam.