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There's a question that has always bothered me. Wtf do you do now that you have an obviously stolen, used catalytic converter? Find an unscrupulous junk yard? Take it to a pawn shop?
They're sold for scrap. Just gotta go to a scrapyard and say "There was something wrong with mine, I replaced it, here's the old one I'm selling for scrap."
That or extract the previous metals yourself and sell them directly.
Many states now have laws that prevent scrap dealers from buying a catalytic converter without paperwork identifying the vehicle it came from.
There are laws that prevent the theft of someone's catalytic converter as well
if you have one, you are "scrapping your own car", if you have twenty, then you find shady junkyards