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Just as a note:
I have the radiator in my (US-spec) CRX completely blocked with a sheet of coroplast. I have no idea if it has helped the aero at all, but it sure as heck has helped the fuel economy! I suspect that is primarily through helping the engine warm up faster, particularly when I am doing EOC. But there could be aero benefits as well.
I have only had one occasion when temps rose to the point of being a concern, and that was on an unseasonably warm afternoon with a long-ish freeway trip. It took less than 5 minutes to remove the block (I have to unbolt the radiator brackets) and I was on my way again.
-soD
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