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hi.
i have friends who race cars and the general feeling is that to cool down under the bonnet/hood it is more efficient to get the hot air out rather than trying to get cool air in,,usually using scoops or louvres ect opening towards the rear of the car.so air flow when driving drags the hot air out..also helps with stationary heat soak..possibly ducting from under the engine bash plate too..
maybe heat wrap or ceramic coating on the exhaust downpipe/headers helps too.
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