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I'm about to cut a giant hole between the engine and radiator in my hood to extract excessive pressure in the engine bay during race conditions. It's more about allowing air to flow through the IC and radiator and then releasing that huge volume of air seen at high speeds. Given how well sealed up the bottom of the engine bay is for aerodynamics I'm seeing a lack of flow through while racing. Hood vents will allow the IC and radiator to work more effectively and you'll also end up with more front downforce.
The aftermarket hoods are vented conservatively which is fine for street guys and will still help substantially.
Thanks,
Phil Grabow
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