Do you plan on putting the block in front or behind the grill? I think the difference on the effect on FE would be miniscule.
I did a partial upper grill block in front of the grill, it was a somewhat difficult. I think doing it behind the grill would have been easier. The way my car is the hood isn't flush with the grill (which is annoying) and soon I'm going to do a full upper grill block behind the grill, looks better that way too because the mod is hidden.
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