I agree with the 'moments around the CoG' theory, that drag above the CoG will turn the car onto its back wheels as Elvo points out.
I also agree with the 'air damn' theory, if air hits a surface and is forced upwards, there must be a force downwards that the air is giving the car (every action has an equal and oposite reaction)
but low pressure and high pressure enduced downforce is not really that much of a deal at our scale.
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