a few things for cheap that you could do would be.
1. flip your front wheels so the front end stance is wider.
2. aftermarket air filter like a k&n or uni.
3. drill holes in your air box lid or run it without one (but if you do this use a prefilter for sure) and dont run it without if your going through mud, water, or a super dusty area.
4. Next step would be a pipe and silencer but the good ones are $350 and up.
K & N is good, Ive heard bad about them too but I feel its prob been instalation realated issues. Ive never had any more problems with k&N than any other air filter.
dude, i dint know about you, but I'd spend more time watching for trees and stuff than how fast i was going, hahaha. And besides, whatever the speedo says, its never fast enough!!!