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I think the small amount of drag over a small duct opening and a short lengthed duct would be more than made up for with reducing, even a small amount, the "wake" left behind my speeding car....?
I'm not trying to replace the air (vacuum) at the back of my car with an enormous duct, but just try to reduce the negative pressure back there, which I think would reap easy benefits in increased aero.
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