Oh, you did have supports in there. I couldn't see them in the pictures. The black coroplast I used probably absorbed too much heat and started sagging because of that.
Speaking of sticking out and catching air, I actually had one of my undertray panels come loose at 50 mph and fly off. I bolted it back on with some wider head screws and washers, and added a zip tie to the front and made double sure it doesn't catch air under it.
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In Reason we Trust
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