I bought a shield when I was living in San Diego and had to park on the street. Cats were being stolen daily. Mine has worked fine - still have the converter and the shield has been quiet. It was $160 on amazon. https://www.amazon.com/Cat-Security-Catalytic-Converter-Protection/dp/B08FRRH3WS/ref=pd\_lpo\_1?pd\_rd\_i=B08FRRH3WS&psc=1