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i don't think this is neccisarily optimal, and maybe more appearance based, but if it was mine I think I would try to make an air dam flush with the front bumper, no openings for air. Close off around any other openings in the front ( in and around bumper, edges of grill, headlights). Then I would just work with the stock grill opening. Start by closing in from the sides, untill I got down to about a foot wide opening. Then start closing that space from the top down. Also like spacemanspif was saying, close off around all sides of the radiator, to make sure all the air that comes through your grill opening, goes through the radiator.
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