i got my K&N filter here now and i have been having trouble trying to fit it on. i see there is a groove in the airbox the exact curcumference as the filter but how do you take that out? how did you other YFZ owners put your's on? any help would be appreciated.

 

What else came with your K&N filter? I bought the Pro Flow K&N kit. It comes with an aluminum flange, bolts, washers and nuts, the K&N filter and the hose clamp for it. It also came with an Outerwears filter cover. With the Pro Flow kit you have to drill out the 5 rivets holding the stock flange into the airbox.
Then you bolt the aluminum flange in. Slip on the filter and tighten the hose clamp and thats it.