As a general rule, if you're going to only block part of the grille, leave the center open. The reason for this is that if you have the sides open as you have now, you are spoiling clean airflow coming from the very front of the car. It is instead best to pull from the stagnation point and let anything outside of that flow around cleanly.
One notable exception is the Civic EG, whose radiator occupies only the passenger side of the grille opening.
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He gave me a dollar. A blood-soaked dollar.
I cannot get the spot out but it's okay; It still works in the store
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