Originally Posted by RoshDawg

Sway bars are a great first mod! Super easy to install and you feel the difference right away.

Oil cooler is also important if you ever do extended spirited driving or get stuck in traffic a lot. If you get an oil cooler, you most likely are into actual performance mods. Pair this up with better brake fluid too for even more street cred

Intake/exhaust as others have said if you need more power and sound. But kenchan is right. The best bang for your buck will be the washer mod, although you will lose the street cred you gained with the oil cooler and brake fluid

CSC is a big issue! Listen to LAVA. Or, if you don't want to spend all the money on a CSC rebuild, you can band aid it a bit with better clutch fluid, RJM clutch assembly and a Z1 SS clutch line.