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Yeah, some air will go in there, but you have to remember that air is pouring into the engine bay through the radiator, and it doesn't have an easy way to get out, so you get a high pressure zone in the engine bay at speed. It's also a tiny slit, and it is set back away from the bumper, so it won't catch as much air as, say, a slit in the windshield. Bottom line, you'll never feel a difference.
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