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Thinking about it, if you allow air to escape thru the bottom too early it may increase the engine bay temps slightly. Heat rises and most of it is on the turbo side. I think you would be disrupting the air flow to the bottom side of the engine if the air gets vacuumed out thru the vents. However without a transmission cooler in place and just free vents, air could get sucked into the bay thru the vents and actually help cool the underside of the engine. Hard to say which way the air may flow and it may be different pending how fast you go.
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