IIRC the Audi Quattro Spider Concept introduce the DLO as a conceptual arch. The New Beetle and the TT coupe over-formalized it. Then they bowed to 'time's aero'.
http://www.topspeed.com/cars/audi/19...ure179268.html
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Didn't someone in the forum build a scale model wind tunnel tester a few years ago?
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If they did it wasn't as good as
Graysgarage's inverted water tunnel.
This isn't a photo, but a conceptualization based on ??? It suggests the intake air is sucked off the top of the detached turbulence.
Possibly a solution like the Mercedes retractable spoiler/Gurney flap?
