We appear to be bulding quite a consensus here.

Note that the things that JC listed that I didn't are great mods, but border on the high maintenance/ reduced daily driver function side. He and I both have an Exedy clutch/flywheel setup, same headers, both have catbacks (he has a catpipe, since he wasn't registered in CA like me) both have intakes, and both have suspension mods. JC's car is probably a tick faster thanks to his engine mods, but my car would destroy his on a racetrack. Different mods for different purposes.