EPA guidelines do not allow mismatching emission components. A California emission certified vehicle must maintain its California emission component configuration, regardless of the state in which it is registered. Installing a federal CAT on a California emission vehicle (even if the CAT is an exact fit) will cause your vehicle to fail the smog inspection. The federal CAT may even cause the check engine light to turn on, as both components (CA & Fed) may not function identically. California ARB certified catalytic converters have passed CARB (California Air Resources Board) bench tests, and posses an executive order (EO) number specific to California emissions components.
posted by SmogTips Support 09-15-2018 03:55 PM