Catalytic converter replacement is strictly regulated by state and federal environmental laws. Installing a non-compliant converter can fail state vehicle inspections and void emissions warranties.

1. Federal EPA vs. CARB Regulations

• EPA 49-State Converters: Legal for vehicles registered in states following federal EPA standards without California emissions adoption.
• CARB / California Compliant: Engineered with higher precious metal wash-coat densities (Platinum, Palladium, Rhodium) stamped with an official California Executive Order (EO) number. Required in CA, NY, MA, ME, CO, and other CARB states.