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so you want to take the air hitting the inside of the fender (creating drag, as the fender works as a king of parachute) and divert it out of the wheel well (effectively increasing the wake of the car) i'll jest restate beroulli's principle here, the greater the difference in pressure the greater the velocity.
i'm not questioning that the effect can exist in this situation, i'm simply stating that you won't see any benefits from any kind of thrust due to the drag from the high pressure area offsetting any thrust created
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