I have basically the same set-up as you, only I run a K&N with a modded air box lid, the snorkel removed, and I also have a shaved head. In the summer I run 210's for trail and woods riding, 240's for when we go to the dunes, and 250's in the winter all the way down to about 15 degress, below that I run 260's. I and quite a few of my buddies that have Motofast pipes have been running our machines like this for years. Mine is now going to get rebuilt over the winter since its down to about 90 psi from the 168 is had when I first modded it in 2001. Hope this helps.