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Those headers are the chrome plated version. I've got the ceramic coated ones and I don't think it was worth the extra money for the ceramic coating because it is peeling off and rusting anyway. If I had to do it over again I would just get the chromed ones, strip off all the chrome, smooth the welds and use header paint on them.
Could sandblast them probably if you use and aggressive enough media. If it was me I would use a pneumatic right angle die grinder (Little hand held) with a 2" sanding disc and strip it off that way. Might be a chemical out their that will bubble chrome too, don't know.