I've always been a fan of keeping the belly pan in place, but you would probably be hard pressed to find one of these cars with it installed.

It MIGHT be that at highway speed it would have a small, probably unnoticable or immeasurable improvement in cooling efficiency, but not enough to start trying to chase down a belly pan.

You would be surprised how much cooling is accomplished on a hot day by the air that passes along the sides of the engine. In the days of hot rodding model A's and early Fords with the hoods off on a hot day, they were DEFINITELY harder to keep whatever engine that had found it's way in there, cool with the four piece hood gone.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

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