Cap City Muffler is a robust aluminum plate that, once installed, provides a strong barrier against catalytic converter theft. Thieves, in less than three minutes, can and will steal your catalytic converter. The worst part is, most of them make a clean getaway. What’s unfortunate, is you the owner, get stuck with the massive repair bill. The superiority of Cap City Muffler is unlike any other product on the market. It’s patent-pending design, is uniquely formed to your specific vehicle for maximum protection. Cat Security™ has captured the eyes of some of the most reputable Toyota dealerships in the nation and is now being carried by them. Their Prius generation 3 CAT SECURITY™ shield is made up of two parts. A front and a rear plate. these two plates together block access to the catalytic converter as well as make it difficult to remove the heat extractor behind the catalytic converter.