I just bought a new White brothers E-series slip on and a K&N power kit. I will be also drilling 6 1" holes in my air box lid. I was wondering if anyone else has or know what size jets i should use with or with out the air box mods. Thanks for the help.

 

If the stuff is new just follow the directions in the k&n box. Did you get a stage 1 or 1&2 k&n kit? don't cut holes in the air box if you don't have the right jet. In the directions it will tell you. I live in Iowa (below 3000' ) with air box mod it said 148 with an aftermarket pipe. The clip doesn't change from stage 1 to stage 2. with the stock lid no holes it is a 136 clip on the fourth slot. be ready to change the bowl screws to something better (stainless allens)