Can you do an air box modification? The pro flow kit isnt a bad way to go. I knowticed a good change with the top off my box. Im thinking about cutting up the box untill theres just enough to hold the k&n on there. You have to let the raptor breath. Your jets will go up a bunch too. im at 175,180 with exhaust, 11:1 piston, proflow.

 

instead of cutting the box,check out the airfilter set up on the jiggle racing raptor.i believe he has a pic on his site .

 

Get a steering stabilizer, pro-flo, rear skid....and most importantly....MASSIVE AMOUNTS OF SEAT TIME.