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yes, I would go with a solid sheet of metal for places unused. Right now I've got a duct tape grille block over the part of the grille where the intake is, so now it draws in air from the engine bay, warming the engine faster and running it about 10 degrees warmer, since it's below freezing right now, this is good. But for the summer, I'll probably remove that and block the rest of the grille. perf probably would just restrict and harm more than help.
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