This is an electric conversion, so I did not need any air to enter the engine compartment at all. I have tested grill blocks on gasoline powered Metros, and I can assure you that you build something like this for a gasoline powered one, you will need air openings. Another word of caution, I built three inches into the bottom of this bumper for an air dam effect, and this does make it risky when I pull into a steep driveway.
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