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can you link the BMW info?
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Here's a 9-page 2011 thread on the very subject:
http://ecomodder.com/forum/showthrea...ain-17418.html
Edit: From April of this year, there's this:
http://www.chicagonow.com/drive-he-said/2015/04/2015-bmw-x5-xdrive35i-coin-lob-into-fountain-of-sports-active-ute-review/#image/3
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Improved Aerodynamics = front air dam Air Curtains [a human hand can fit through] and prominent fender Air Breathers.
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I think the key is high-velocity air in a converging duct.