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I would have done the following:
Air extractor in hood, with ducting directly from radiator.
Side vents from engine bay....that heat has to get out.
Vent in rear bumper...this would help pump out some of the exhaust heat as well as drive-train heat. You would probably have to make a proper venturi with an extension at the end past the bumper in order to allow for a sharp end and prevent a vacuum from stagnating the air back there.
Exhaust wrap and stainless steel with sandwiched fiberglass heat shielding through out exhaust track. It would be great if you could exit the exhaust way up front MB SLR style....
Vents immediately aft of engine bay in undertray...again engine heat needs to go somewhere.
I think that with these improvements you would see even greater fuel economy, better component longevity, and certainly reduced cabin temps....as well as better high speed stability
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