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A large diameter intake tube means that for any given the volume of air movement, the air in the tube is moving slower.  This increases the possibility that the air in the tube may stall during deceleration, and that means that when more throttle is called for there will be a bigger lag between the trottle input and the intended result.


Another problem is that the airflow sensor lives in that tube.  Slower moving air will be sensed as less air movement, and a lean fuel mixture may result.  This, of course, drives engine temps up, reduces the longevity of the engine, and will likely throw codes.


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