There are tons of things you can do. One of my biggest bangs for the buck was the lightened flywheel (~$300), that made a helluva difference! That is if you have a 5-Speed. If you don't, you could do that swap too (~$600), I did that it was a lot of fun. Or if you like brakes, convert your rears to disc (~$350). You could bore out the Throttle Body for around $175, that made a pretty good difference too...