to the thread starter:
loud - LT's, 2.5" h-pipe (not from mac, their cats are pieces of ****), pypes mini cats (or offroad, if no emissions), and a chambered muffler (force mufflers are a knock off flowmaster, are cheaper, and sound better)
good - LT's, 2.5" x-pipe, pypes mini cats, and a flow through muffler (magnaflow, dynomax)
h-pipes go with chambered mufflers, x-pipes go with straight through mufflers, and straight pipes go with anything. turndowns sound like ass inside the car, plus you cant carry on a conversation without shouting.
good luck