As stated before you won't be dissapointed with Kevin's porting at all. I hesitated for the longest on porting & tried my best to get the most HP out of my shee with bolt ons. Porting really wakes your shee up man. I wish I had been got the porting done. Any site sponsor will get you alot faster than what you are now. Just tell them what kind of riding you mostly do & they will hook you up. I smoke yzf/trx/kfx/lt-r 450's, raptors, some banshee's, 250r's, predators, outlaws, 450r dirt bikes all day long after kevin gave me this nice ass stoke stroke set-up. I put my GARMIN GPS in my pocket & it clocked me @ 93 mph & I didn't hold the throttle wide open for a long time in 6th gear.