As to your original question;
without engine work, you are pretty much limited to exhaust, filter/airbox, PCommander and a dyno map. These mods will yield about an additional 4-8 rear-wheel HP (at least on our Dynojet 250i that's what we see).
If this is a strictly track machine, you can coax an additional 2-4 HP out using MR11 or 12 race gas, but you'll need to drain and flush after each weekend.
After that, it's pretty much crack it open; there are high comp kits, stroker kits, big bore kits, cams, bored-out throttle bodies (which won't give you any more HP till you've done the other stuff).
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