Good god. This is funny.

Lsnaple, a big part of the reason that people rag on kids in high school (beyond the fun factor) is that even if you do pay for it yourself, you're not supporting yourself. I fork out over $1200/mo just for rent and bills - in all honestly (and not being insulting), you probably don't make that much in a month. Congratulations on your mods, they're well chosen (although, why in hell would you buy Tein springs and not just get the coilovers?).
As for free mods, the aforementioned airbox mod and playing with the timing are about all there is. Honestly, if you're like most of us and want serious power (or at least, more than the KA with boltons can provide), I suggest saving for a swap.
My money goes to suspension and brakes first (gotta learn to handle the car before the zoomzoom arrives). My Eibach Pro-Kit and KYB AGXs came in yesterday from Heavy Throttle. Then comes the catback, short-throw shifter, and squeeze (yes, nitrous oxide). Then comes the CA18DET.
Good luck to you, and I do recommend you SEARCH before posting - it will get you the answers you want more quickly and without the flame factor.