Well the stock filter is in a box and the mass air flow sensor is in a wierd housing so a cone filter couldn't fit on it. What I did was took the top part of the box off leaving the four studs that come out of the mass air flow sensor housing. Then at auto zone they have this plastic piece that converts square to round 4" and has 4 holes on the outside corners. Well those holes didn't fit on mine so I drilled some more and screwed that on in place. Seal up the little area that the plastic piece doesn't cover with some blue rtv or somthing similar and walaaaa better air flow for the cost of the filter and a piece of plastic that was $4.99 I will post pics when I get a chance.