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several thoughts.
1. potentially as frank lee suggested, it is much easier to design 'adaptive skirts' similar like the technology in adaptiver grille blocks.
2. Bmw is using air as a way to reduce drag over the tire on the 1 series (previously threaded)
3. the greatest problem is consumers removing items. The factory front belly pans come to mind. part of automotive design which is often overlooked is 'consumerablilty'
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