I must disagree with the differences between wings (in off-road at least) being purely drag, they do create a downward pressure of some sort. Different sized wings make a big difference to how the car behaves in the air, big wing on the back = nose up, front wing = nose down.
I don't see how that could be caused by drag alone, as surely with the wings being rigidly attached to the car the drag relative to the forward movement acts on the whole car. There must be downforce of some description happening or we wouldn't see different behaviour in the air by altering the wings at either end of the car.
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