Any area that is not directly infront of the radiator should be able to be blocked off without any ill effects on cooling. Even at that, I'm sure you can block off more and create 'flow directors' of sorts, basically, make sure the air flowing IN the grill it going through the radiator and not just blowing around violently.
Ya know, since the rest of the car is soooo aero. (Mind you, I have a '00 Ram Truck)
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- Greg
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