The cost of replacing your "radiator" would outweigh the gained aerodynamic efficiency. Average radiator is ~$100 (for a non-aluminum unit), and anyone that's wrecked a newer car will tell you that a new front end is a good bit more than that. Proper direction of air flow will do better for cooling than any fancy radiator hood, Tatra made a car before WWII that was air cooled and ran cooler than most modern vehicles.
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