Actually... you CAN powdercoat Aluminum... the actual powder that you spray is electrically charged by the gun as it leaves it. The surface that you are spraying should be electrically grounded so that the powder will "stick". The powder is made of plastic that melts when heated. The only drawback I can think of when coating an intake would be the plastic will act as an insulator and allow the engine to retain and heat up your intake charge as it enters the engine possibly robbing you of a few horses.
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