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First off, you can't "scale" the grille from drawings or pics to suit your car. Even if the principle worked (which I don't believe), the Reynolds number would be wrong and you haven't accounted for the rest of the shape of the nose.
I'm with cmroseberry -- I don't believe the theory that the flow splits differently based on speed. There's nothing in aerodynamic theory or practice that would support this. Yes, I am an aerospace engineer.
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