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Great stuff as always. The only downside I can see to that obviously very necessary painting of the catalytic converter is how an acid wash would change the color of the paint. If you ever wanted to acid wash the converter in order to restore its functionality after getting a catalytic converter "inefficiency" code, the acid bath itself would stain the paint. You could repaint it if you wanted to, but I doubt that the staining of the paint would change its rust prevention capacity.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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