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If it pulling the air from outside the engine bay, then it holds the power that would normal decreases if engine was pulling in hot air from the engine bay to cause timing retard instead.
I made my own. My car runs better sucking in cold air that it does Hot air, especially in the winter months. I've noticed some hot air floating around here.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.