f4i performance upgrades?
just picked up an 01 f4i and want to know what kind of performance upgrades i can make. this is my first street bike but i usually ride dirtbikes and atvs. anyways what type of upgrades are there on the market? gearing, exhaust, headers, engine mods? some offering me a two brother exhaust for $50. any major differences with the exhausts out on market? there all straight through right? give me a list of what mods to make first and a rough price. thxs