[BevanWright]

Bill E - are you sure that the air flows out of that scoop? Why I ask is that a few years ago a friend had a saloon and had a scoop just like yours, and when he tried putting some strings of wool on the car, and driving down the road the wool sucked into the backward scoop. (showing that the flow worked opposite to what he thought). The reason for this is that the windscreen creates a low pressure zone, which the scoop sucked in and directed the air under the car. Some people also use backward scoops to feed air-intakes for carburettors.

Anyway - just a thought - might be worth testing.