For $77 on Amazon I purchased a guard which goes on the bottom of my car over the catalytic converter to prevent theft. That's what I'm doing about catalytic converter theft as I have one of the most desirable converters on an older prius. I don't expect the cops to be standing next to my car all night, and I'm doing what I need to do to protect myself. I also lock my doors when I leave the house and I have some cameras. I did the math, and considering the deductible on my insurance, it was the cheaper option.