Yoshi RS9 exhaust (i did stainless). made the bike easier to ride and more "fluid"
I put hammerhead titanium foot pegs on my bike ($200). I wore down the stock ones and figured I'd try these, they are wider than stock. They also have much more grip and hold up better so far. I would definitely purchase these again.
I also have the works radiator braces for a little added support. They were kind of a pain to install initially but so far so good with the radiator shape.
I also put a gripper seat cover from rocky mountain atv, Its call the "attack" seat cover. It was cheap in price but great in quality.
I revalved and resprung the suspension to a stiffer setting.
SuperSprox sprockets and an X-ring chain for durability.
Chainslider set from T.M. Designs for durability as well.
I put an 8 plate clutch pack in the bike from barnett and I have enjoyed it so far.