There is low pressure on top of the hood, which is cooler then high pressure. This gets "sucked" in like a vacume. That is why ppl have cowl hoods to take advantage of the colder air. Only carbed motors can use this to their advantage without spending an arm and a leg to run a custome intake design. If you check out NASCAR's, there is a "hole" infront of the windsheild. They are using the same concept, but with better airodynamics.
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