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Yes, ideally we don't want to trap or speed up the air. we want to guide it around the top and sides as smoothly as possible without accelerating it much. And if we have to displace it, we only want to hit it once and be shed of it. but We need air thur the radiator, so the trick is getting the most out the air that we duct thur, rather than using a huge amount of air inefficiently. So we try to use the air that has to be displaced the most anyway. And the air in the center under that bumper looks like good air to put thur the rad. Also we want the air to exit in a low pressure area. Which hopefully we can create under the truck with a dam. The mfg's try to design these grills so they slick over(stall) at higher speeds and bypass the air. Maybe someone could design a rad. that is long and narrow for min CdA. Like the skin of the car. ouch
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