Be sure to get the Motorcraft filter from Ford. The WIX (NAPA/CARQUEST) filters do not seal between the lid and lower section of the airbox. As a matter of fact, if you want my "DIY 6637" intake, I'll just send it to you. It needs a new filter, but you can have it if you want it. It's simply a piece of 4" exhaust pipe.....
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