on formula cars as well as sports racers (Formula car with a full body)
The ducting of the air through the radiator has huge effects on speed.
The EVO/Touring Cars all duct their air up through a tuned hole in the hood so as to take the firewall air out of play aerodynamically.
But you have to rethink engine insulation, there is a lot of stuff under the hood that needs some air flow to stay healthy. (Alternator, electronics etc)
Dave
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