Max, thanks for starting this thread. Hope you don't mind I fleshed out your thread title to make it more descriptive & attract more eyeballs.
I think you will find that the members who have made & tested undertrays with flat materials have found improvements for the reason you stated:
Quote:
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it may improve a little bit over the pumpkin and other bits that hang from the bottom of your car
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So I think it's important not to throw out the easy-to-construct baby with the optimally-designed bathwater.
For that reason, I'm glad to see you tempered your language from the earlier assertion in other threads that a "flat belly pan is no good" to a
flat belly pan isn't going to do as much good as one with these optimal design properties (paraphrasing).