[kidrock]

IIRC, there are a few contributors with painted or powdercoated intakes. On some, it looks pretty good. On others...meh.

I think polished runners would look awesome...but you'd probably never be able to keep 'em in good condition.

A couple people have mentioned having the inners done with ceramic coating. I might recommend against this. Porsche has done an excellent job engineering these motors, to the point where there is truly not much one can do to inexpensively modify and realize significant horsepower. Chances are, the intakes were engineered to pretty exacting specifications.

For a short time, Harley Davidson enthusiasts were polishing the heads of their Evolution motors...thinking they were getting more bang for their buck. In reality, they weren't realizing any true gains...because the rough texture of the heads near the intake were specifically engineered to "break up" or atomize the incoming fuel more efficiently. Smooth, polished heads defeated that purpose.

I know these aren't Harleys, I am only drawing a feasible analogy.