Aftermarket Catalytic Converters
What is an Aftermarket Catalytic Converter?
Original equipment (OE) catalytic converters are designed to last the life of properly maintained light-duty gasoline fueled vehicles.
Occasionally, older high mileage vehicles may require a replacement converter because the original catalyst was damaged, destroyed, or stolen.
The cost of a new OE converter may not be justified on a high mileage, older vehicle or may not be available. It is important to maintain the presence of a properly functioning catalytic converter and oxygen sensors because they are integrated into the engine management controls and assure proper vehicle operation, performance and fuel economy.

Over
catalytic converters have been replaced under these programs
In the U.S., a federal aftermarket converter program with specific requirements has been in place since 1986 and since 1988 in California. Both Federal and California programs require aftermarket converters to meet minimum performance and durability standards.
Increasingly tighter emission standards and durability requirements for new light-duty vehicles have resulted in significant technology improvements in three-way automotive catalysts.
These improvements, in turn, have been implemented into compliant aftermarket converters to assure proper function and performance. California further amended their aftermarket converter program in 2009, doubling the durability requirements and tightening aftermarket performance standards to require they match the original certification limits of California vehicles.
Manufacturers of Aftermarket Catalytic Converters
The companies below are manufacturers of EPA and CARB-compliant aftermarket catalytic converters: