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I believe NACA Duct is the term you are looking for.
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not really , sorry, naca ducts are always intakes, they have to face forward ... sometimes they're used as hood scoop alternatives, as extractors they would just serve as any other hole.
i wich i could recall where i'd seen the picture of what i'm referring too... but it was basically a backwards facing scoop on top of the front fender. it was definately an extractor.