i dont think body shops are gonna sell many cats, if the damage goes that far into the car it is totaled 90% of the time
on cats you need to know the types such as pellet, foil and ceramic honeycomb, then you need to be able to tell whether its domestic, import or aftermarket, theres alot of variables
the best thing to do is get pictures and send them to cat buyers, then you know approximately what you should offer for them
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