Got the header pipes all cleaned up.
Chrome is long gone, so I sanded them down with 180 wet&dry and then hit them with the wire wheel.
Other than the finish I'm pleased with the condition of the pipes, no dents, metal is sound. The gauge of the pipes is typical German over engineered heady gauge steel.
For now I'll leave them a la natural. Put some gun oil on them then wrapped them up in butcher paper for storage.
Chrome is out of the question. California ARB killed chroming in CA.
Asked one shop about ceramic coating... $165... OMG! It's just three stinking pipes for crying out loud, $165...