There is lots you could do mate but to be honest, go for the hooked airbox (speak to Tash on here, extreme performance solutions) change you exhaust to aftermarket and add a PC3 with USB mapping and then live the dream, you can look at gearing too, a 16T front and 43T rear will give extra acceleration and minimal top end loss whilst using standard chain length or go 16-44T with longer chain for even more off the line but but off top end. I am fitting the 16T 43T and then off to Dyno over xmas. Ebay 2nd hand power commander (PC3) for about £120, airbox about the same, exhaust varies. Also you could speak to RedRat bike on here as he does a modified header pipe for your exhaust system for something in the region of £120 + your old one in exchange. I have not fitted one yet but am planning on doing so again over xmas standdown period prior to Dyno. Cheers Jonny