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What is 'The Theory' behind these vent things and what are they called??
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Your search term is 'air curtain'.
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EcoModder.com
Air Curtain - Fuel Economy, Hypermiling, EcoModding News and Forum ...
"The new Air Curtain is the latest innovation BMW aerodynamics. First introduced in the BMW 1 Series M Coupe, Air Curtain now would be a standard feature on the 128i Convertible. Air curtain increase airflow around the front wheel arches with the benefits of turbulence are significantly reduced."
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Impossible is just something we haven't done yet. -- Langley Outdoors Academy
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