i see what your saying.... and i dont pretend to be a big expert.... or a little one lol...
i may be wrong but in my mind the back of the car where the air is all being dragged along by the car has to be a low presure area surely... compared to the roof anyway... thats how it looks to me from the first pic i found below
so it seems like it would get sucked through... you would obviously need to actually know what you were doing to make it work, size of entry and exit... shape of it
roof inlet or scoop.... i dont know im just thinking outloud
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