Aftermarket cats will usually have markings like N/CA, CA/TA or something similar. Many also have a manufacture date stamped on them (02/06, etc.). Some can be tricky to ID until you get very experienced with handling converters. Then, there are some good OEM cats that look like they would be aftermarket. Some round Nissans and Fords have no heat shields and no numbers or markings from the factory, but they are good OEM cats.
If you're ever unsure on a converter, make sure you're set up with your buyer to text pictures to them for a positive ID. Any good converter buyer will provide this service. That way, you won't get stuck paying good money for a $5 aftermarket, and you will also know that you didn't accidentally buy a good cat as junk.
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