I've probably neglected the underbody in this tread.
Found this:
https://www.audi-technology-portal.d...tics/underbody
Quote:
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A car produces 40 to 50 percent of its total aerodynamic drag in and around the underbody, the wheels and the wheel arches..........
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Click link above to see video.
<iframe width="560" height="315" src="https://www.audi-technology-portal.de/video/261" frameborder="0"></iframe>