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i spoke to a fellow today who said they scoop the air at the front and channel it up to outlits up at the windscreen, this creates downforce at the front and helps to push the air over the car when it hits the windscreen.
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the brakes must get pretty damn hot then
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I can see the vents at the base of the windshield. It makes sense to me. Massive amounts of air in at the stagnation point and a smaller vent at the base of the A-pillar.
The converging duct means the air out of the vents is moving faster and pulls any high pressure at the base of the windshield sideways.
As opposed to using the air for an air curtain over the wheelwell opening. The flow for brake cooling is just a plus.