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I've always wondered that going with a grille block on the TJs would actually make it worse cause you have another flat surface moving through the air.
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remember that the Radiator is right behind it, and it IS another flat surface moving through the air. without the foam, you have turbulent air hitting the grille openings, then it's hitting and going through the wall-like radiator, which gets sucked by a fan (if there's a mechanical one) and pushed into the motor, which gets jumbled around. It's basically gonna be the same, but maybe direct more air around the jeep. without smoke or windtunnel testing I wouldn't know for sure
