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A rough texturing on the intake side of the engine is a good thing. It helps create a thicker boundry layer at low intake air velocities. This ends up speeding up the air flowing directly through the center of the intake. We should all know fast flowing intake air is a very good thing as it increases in cylinder turbulence and increase torque. As the mass of air flow increases the boundry layer gets thinner to accomodate the increased volume. At some point this will create a restriction, but for us this should never be a problem since we don't use anywhere near peak horsepower. Polishing the intake will reduce the boundry later and therefore decrease low rpm torque. As LostCause mentioned, this is generally bad for mpg.
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