ive been building my hatch that i baught with a blown d16. im going for a sleeper look and so far my mods are. -jdm b16a -url crank pully -dc header -full 2.5 exhaust -gsr cams -cai now it looks like it belongs in a junkyard, has the trim ripped off (holes still there) faded black paint on half and black primer on the other half, steel 15' wheels, and a few dints. it also has z3 fiberglass fenders that i thaught would give it the appearance of being "rice" and therefore slow but i think im going with stock ones. my questions are what can i do to make the exhaust quieter and whats some good mods for a sleeper? i want to boost it but thats not very hidable.. thinking nitrous ?