If you look at the picture I posted previously
Edelbrock proflo open air intake with TBI spacer and cowl hood. Filter is open all around and on top. Performance gains? No clue, don't have a way to measure temps or HP. Coolness gains? Definitely, sounds cool because it's always sucking a ton of air :head3:
Then look at this one, The grille with panels meeting the headlights, then directly below them, then the parking/turn housing bolted to the grille (directly in front of the CAI port) with no gaps between them, and the trim piece just under the bumper and connected to the grille, then the valance bolted to the bumper, it looks to me the air will have to go around them, in front of the radiator and get sucked through the port in the core support.
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I'm thinking whatever pressure built up when the truck is moving is diminished somewhat by the air sucked in by the radiator and fan.