I live in CA too. This bugs me SOOOO much. If I put on JBA’s, dual 3” exhaust, and kept all four original cats, I can’t see my truck producing any more smog than stock. If anything, slightly a more efficient running engine. In CA you can’t even buy a converter that is not made by the OEM manufacturer, what a financial crock that is for any consumer.Man I wish these where Carb compliant. Just moved back to cali and hate these emissions.