Thanks Everyone!
Yeah, I plan on buying some standard after-market parts (intake, exhaust, headers) once the weather gets a little nicer, probably around this April. Hopefully I can make it to some 370 events and car shows to hear what the difference in sound will be for each kind of upgrade, and also different companies and types (i.e. Long/short headers).
As far as ascetics go, I'm looking at buying some 19'' black rims (undecided on which) and the 180Custom lights (also undecided on which style). haha, I always move slow with my decisions. I'll be sure to post with what I do either way, to get your opinions