Colorado Catalytic Converter Theft - Advice?

I’ve been through this in CA and CO, both passed an after market cat welded with extremely amateur abilities (no one looked under the car). To be specific these were testing sites in riverside ca and Fort Collins co. ..also spray paint inscribed with “aftermarket cat fuk off” and “quit smoking dope” seemed to prevent further thefts

 

Thank you very much. This info was helpful. I might just sell my OE Cat to help somebody out. My county doesn’t have inspections on CATs.

 

Where did you sell it. I’ve got my original oem cat but can’t figure out where to sell it

 

Here's one option you might try: https://rrcats.com/