When you select Federal, California Air Resource Board (CARB) compliant catalytic converters will be filtered out of the search results. Outside of California, New York, and Maine, it is unnecessary to use CARB compliant catalytic converters.

When you select California, Non-California Air Resource Board (CARB) compliant catalytic converters will be filtered out of the search results. All vehicles registered in the state of California require a CARB compliant catalytic converter in accordance with state law.

When you select New York, the year of your vehicle and the design of the emission system will dictate if the search results will show California Air Resource Board (CARB) compliant converters or Non-CARB compliant converters being required.

When you select Maine, the year of your vehicle and the design of the emission system will dictate if the search results will show California Air Resource Board (CARB) compliant converters or Non-CARB compliant converters being required.