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Is it possible that a properly sized slot used as an air intake has an actual aerodynamic advantage over a block? A block means pushing the air aside, which is drag. An intake that is sucking air in at something close to the car's speed, should be pretty clean, aerodynamically s[peaking, I would think.
As for the ram air effect, the only way I see it possibly helping is during pulse and glide operation and I'm not sure if it is helpful there. I could certainly see where it is a hinderance. Remember, a CAI means less air is needed for a given power output. And less air means more pumping loss.
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