Have you guys been removing your backfire screens from the airbox?? Does it make any difference? I was thinking of doing this, but dont want to burn my bike up to get 1/10 of a hp? Also while your reading this i am considering a new fmf muffler, mxa says the fmf speed muffler is a great way to smotth out some bottom end and add a little to the top, and its only $299!! is this the best way to get a little more out of the motor w/o sacrificing reliability?