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There's a good aero argument for slowing cooling air down before it gets to the radiator--loitering in the radiator increases the heat transfer to a given parcel of air, so less air mass is required for a given amount of liquid cooling, so less air is needed, so the air entry opening in the body can be smaller--in racers it's done by guiding the air through an expanding duct. Hard to do as a mod to most cars since there's not much distance between the air entry opening at the front of the body and the radiator, you'd probably have to build a new nose...pardon the rambling, what I'm wondering is if this might reduce the radiator clogging as well. If less air mass goes through the radiator, that's less bugs too, and maybe slowing the air would slow the bugs enough to make a difference in their depth of radiator penetration/adhesion.
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