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With a smooth underbody, do side winds going under the car really matter? Side skirts would direct more of the air around the car, but they would also present a larger area for the wind to blow against.
I think side skirts might be easier for me to make, but I could build deflectors and boattails that wouldn't catch on speed bumps. Anything more than about 2" on a side skirt would have a good chance of scraping.
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