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I've actually done this with coroplast on my car, in conjunction with a grill block and undertray, and even in the summer in stop-and-go traffic temps never got that high--not even tripping the fan for longer than 15 secs at a time. Of course, aero doesn't matter in such conditions, but it illustrates the basic effectiveness of the design. I would venture to guess that I can now make the grill opening 2/3 the size of what it would otherwise have to be.
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