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Don't use the SS sheet: Too heavy, expensive, and noisy. It will vibrate like a big base drum or worse, and you'll have to listen to it. If it gets loose and detaches, it could slice up a tire or two at highway speed, so there's a safety issue, too.
Better to use coroplast. You could easily cut a NACA air intake with a carpet knife, and finish it with duct tape.
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