I'm not positive, but I think to have something powdercoated, it has to have a magnetic charge sent through it so that the metal powder adheres to it. Since aluminum is not a ferrous metal, it will not work. Possibly anodizing will work, but since you want your air/fuel mixture to stay as cool as possible, and aluminum holds heat,you should either have it bead blasted, or polished to have the best look. Sealing the pores of the manifold, will only hold in more heat, which will cause vapor lock. Good luck on whatever you decide to do.
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