^ Since you've got the SS section 1 and 2, I'd get the SS Race muffler first. I think then your car would be plenty loud. If it's still not loud enough, then get headers...though ours are already catless so not sure how much a difference headers will make. But from the clips I've heard, going to aftermarket catless headers gives a more throaty sound. Expect more drone with a louder setup though.
Evolve CSL airbox w/Alpha-N tune | KW v2 | Vorshlag Camber Plates | WORK Equip 18x10/12 | Dixis Ti exhaust