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  1. power gains for porting and polishing upper and lower?

    V6 Tech
    What kind of power gains can I expect to see on a 2002 v6 with port and polish on upper and lower intake with the Throttle body hole opened to 70mm? I want to take my upper and lower intake off to take them to a shop, has anyone ever done this is it difficult?! Or does anyone know of any good...
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