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airaid
volant
k&n
I can understand more air, but the plenum opening is the plenum opening. No matter how big the tube, it still goes through there. As for less turbulence, it seems like there is more with the current CAI's given the pedal vibration that you get from an AFE ( and maybe others). I'm no scientist, so I am just taking a guess here. It's just my impression. Seems like a good drop in, besides the high end filters, would accomplish the same air flow.
I learned a little about this at school. PV=PV. So as more air comes from the tube at a certain pressure, as it goes through the smaller plenum opening volume remains the same however pressure of the air going through increases. So it really is more, even if there is a decrease in size diameter somewhere along the system.