If you plan on bringing this vehicle to California and registering it here, it will need to have only the emissions components which it was originally equipped with when it left the factory. In otherwords, if the car has only a 49-state legal CAT, that's fine. So long as you havn't modified it in any way.
New vehicles, on the other hand which are being brought to California, must be equipped with 50-state (California) legal emission parts... such as an OBD II compliant Catalytic Converter.
posted by SmogTips Support
