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Hmmm white paint would not clean well will it? My IC pipes are powdercoated, and a quick wipe with a rag and they are as new. I am not sure how the intake manifold texture will handle powdercoating though. Paint would as lest get into the texture.
Powdercoat will work fine on the intake. I just had mine done along with the cam cover. Turned out great (Glossy black). You should off gas the parts first.
Here is mine a couple weeks ago. I've almost got the turbo out (havent worked on it much since before christmas.) Lots of new stuff is going in so hopefully it'll run great!