i cut off the bottom of my air box and took the lid off. that way i could keep the mount for the computer on one side, and the other will act as a heat shield. i then took a gytr filter for a raptor 350 and drilled a hole in the top of it. pulled the factory filter off, cut the screen out, then screwed the gytr fileter in its place, and locked down the band clamp. it uses a 2.5" inlet like the aftermarket, surely it flows just as good, and only cost 35 bucks.