This product is EPA compliant  not for sale or use on vehicles certified for the state of California Consult your state or local authority for any additional clarification Replacement of catalytic converters (if equipped) is allowed only under the following conditions: 1) It is missing or stolen  2) It is damaged or lead poisoned as determined by a state or local inspection facility  or 3) It is outside of the manufacturers warranty period (consult your owner’s manual)  if none stated  5 years or 50 000 miles