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you are wrong... or more importantly he is...
the simple fact is that na motors work on a simple suck, squish, bang blow theroy.
the suck is all you need to know. the more air that is avalible at the bottle neck the better. matching the diameters has nothing to do with pressue and avalible molocules and the flow up to the throttle body is always hitting a bottle neck at the butterfly plate anyways. the goal of a cai isn't to allow for better flow into the motor... it's to provide the tb with as much air as possible to suck from at it's mouth.
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