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I was curious about the function of the hood vent so I tied a piece of string to it and went to a track day.
As others have posted, it is a vent (the string stands up and waves around) until you're at full throttle and high speed - then the vent becomes an intake and sucks air into the engine (the string collapsed against the mesh grill).
It doesn't need a flap - it works fine the way it is.
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