Not Ranked
I'd have it ceramic coated. Ceramic coating looks great, is easy to clean and is relatively cheap. I had mine done. Pictures are in my gallery. While I've never tried polishing an intake manifold, I did polish my own timing chain cover. It was fairly easy because it's small and there are not a lot of crevices. That did, however, convince me that I'd never want to do an intake manifold. There are just too many nooks and crevices. Without a lot of specialty tools to get to those tight spots, you'll be there forever and it won't come out that good. If you have your heart set on polishing it, I think I'd pay someone the $200-300 they're likely going to want.
Chris
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