:yfz I just put on a gytr slip on aluminum pipe and I installed the k&n air filter with the gytr adaptor kit. I still have my lid on but i cut the spout going into the air box off and i put 4 quarter size holes in the top of the lid. My question is shouldnt I need to jet my bike or can i get away with just tuning my fuel screw?? Just wondering b/c I had my bike put in the shop and thats all they did to it. They did not jet it and I thought they would have to. Just so ya'll know my bike runs like w00ter. I'm taking it back in so they can jet it b/c i'm sure thats what it needs. ANY SUGGESTIONS????? Does anyone else have just those two mods done on the yfz???