I was wondering if you made a grille block with openings covered with very fine screen, as the speed builds more and more air would bypass the screen and go around the car, sort of self limiting by design , then at slow speeds up hills, traffic, etc, the air is pretty free to get to the engine, because your going slower. just have to est the screens size by size and go small enough to cause temps under hood to go up then go one size larger, might work just right . .
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