Dont bother with the FMF, dasa, CT, lonestar, hmf, sparks are the top HP makers on these quads.
Flexbars, anti vibe stem, steering dampener, a-arms, reworked shocks are what I would be looking for. Id also suggest tossing the airbox lid, jetting it and using a foam air filter line a uni brand filter.
-2004 450R. Far From Stock.. Sold, crank was going
-2006 450R. New WHIP..
-Do it right the first time, and you wont have a problem later. Being cheap or taking the easy way out only makes matters worse later.
-Your Backyard Mechanic Extraordinaire: Responsible for bringing you redneck, ingenious and often interesting ways how to fix things.
-You can watch things happen, you can make things happen, or you can wonder what the H*ll happened. Captain Phil Harris