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There are places on the hood where the pressure differential wants to draw air in, and places where it wants to go out. Toward the front is usually negative pressure and then at the windshield there will be a lot of pressure that would force air into the engine bay. If someone wanted to test they could put manometers in different spots of the hood.
I always thought it was interesting that the fake hood vents on the old GC impreza are exactly where the radiator and intercooler duct outlets were on the WRC car, so there was something to it.
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