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^^
He's right, you know.
If you want to know more go [citation needed] on Bertone BAT, VW Golf GTI 660 W-12, Ford GT40, or many recent Ferrari.
If the opening slot was horizontal, not vertical, drag wouldn't be added. You'd do better to remove the rear side windows and the back window and add internal ducts. Black expanded metal mesh would make it 'unobtrusive'.
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