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I agree that blocking the upper grill is the best place to start, and then I'd block part of the lower grill, too. The plenum in front of the radiator might need sealing up, so all the air that does come through the lower opening goes through the radiator -- typically too much air comes through the grill opening(s) so they vent air away before it goes through the radiator.
And a louver in the middle of the hood (behind the radiator and behind the point the air flow starts to "lift" off of the hood) would help pull air through the radiator; making it possible to reduce the intake opening even a bit more.
I would ideally add some partial front skirts, too; ti end up close to the original Insight's front wheel openings. I have these on my xA and they help.
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