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Porting?????

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    #1

    Porting?????

    Does anybody know how to go about porting and polishing the head and air in-take manifold etc.
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    #2
    Extrude Hone - Deburring - Polishing - Finishing metal parts
    http://www.extrudehone.com/
    Extrude Hone offers Metal Part Finishing with machines, Contract Shop Services, Abrasive Flow Machining, Electrochemical Machining and Thermal Deburring.

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      #3
      extrude honed M20 intakes are a complete waste of money! save your $500 and buy a MAF conversion kit instead.
      Build thread

      Bimmerlabs

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