Thieves Caught Stealing Catalytic Converters in Parking Lots (You Won't Believe This), DIY and car review Scotty Kilmer. Catalytic converter removal and theft. Illegal car modifications. How to remove catalytic converter. Car parts stolen by thief. Why cars are being broken into across America. How catalytic converters work. Car Advice. DIY car repair with Scotty Kilmer, an auto mechanic for the last 55 years.