the biggest thing would be in HOW you compliment the hood. If you want to see what hood style might be most functional, look at what is used in professional racing circuits. What i find interesting when i look at say, Le Mans cars, very very few of them use the same style of venting, some dont even have a vent hood at all. Makes you wonder how well the concept has been researched.
But the other issue to think about is if you want air to EXIT the hood you need to have the area on top of said hood to be at a lower pressure than that in the engine bay. That means your air tract coming in from the bumper needs to be well designed. Meaning the use of at least the factory undertray, good sealing and ducting of air as to give it few options of where else to go.
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