It's easy, I saw these for sale on schmidt brothers performance page, but this way saves you $30 bucks and you get 4 H.P. just buy a set of Uni Filter AirBoX vents. They are $9 to $11 for the pack. I got mine of rockymountainatv.com when you install make sure it's low enough to actually allow flow into airbox. If its too high they are useless! Have a great day. Oh yes and glue the foam in, and then the filter into your airbox.