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The reason for leaving the intake smooth is a different story from different people, basically what i understand is that leaving it rough is like leaving the dimples on a golf ball. So what it's doing is letting the air move more smoothly. Rough surface creates a smooth flow? Kind of counter intuitive but it does.
My machine shop glass beaded it to make it rough, i'm not totally sure what that is, but i think it's like sandblasting but with glass beads, but it left a nice finish
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