Also in the case of the Insight there are large openings where the tie rods go from the rack to the front wheels. I believe this is to allow the air to exit to the rear of the front wheels. It's possible (not sure but possible) that reducing the air flow into the engine compartment could cause more turbulence around the front wheels and have a negative effect on CD.
Just a thought.
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I like the upper opening staying open because the top of the radiator is the hottest portion. I may try adding a radiator block if it gets really cold here. Today it hit 71 degrees.
regards
Mech
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