Stops Catalytic Converter thefts! (inexpensive method)

Just my thought, but I think you'd have trouble justifying shooting a thief under your vehicle when the vehicle is in the street. Even a stand-your-ground state judge and jury may have issues with that. You may want to, but in the long run defending yourself is going to cost you a lot more money than what a new catalytic converter would cost, even if insurance wouldn't cover it.