AP Exhaust 643142 Catalytic Converter - Rear

AP Exhaust Direct Fit Converter for Subaru

AP Exhaust Direct Fit Converter 643142 is a Federal / EPA direct-fit catalytic converter built for Subaru applications that require OE-style dimensions and fitment. It uses a ceramic substrate and stainless steel body construction to support efficient exhaust flow and emissions control on the listed Legacy, Outback, Forester, Crosstrek, Impreza, and XV Crosstrek applications.

The AP Exhaust Direct Fit Converter line focuses on exact OE dimensions and fitment, using advanced manufacturing methods to help maintain consistent build quality across production. For Subaru owners searching for a direct fit catalytic converter for 2011-2019 Subaru Forester, 2015-2019 Subaru Legacy, or 2016-2017 Subaru Crosstrek, part number 643142 is built for the listed rear and non-position-specific applications.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body material for corrosion resistance
• Ceramic substrate material
• 3-bolt welded flange inlet design
• 2-bolt welded flange outlet with gasket stub
• Inlet gasket and outlet gasket included in the design
• Two O2 sensor ports
• Overall length: 60 inches
• Built to OE dimensions for listed Subaru fitments

Detailed Description

AP Exhaust 643142 is engineered as a direct replacement catalytic converter for specific Subaru exhaust configurations. It is listed for 2015-2019 Subaru Legacy, rear; 2015-2019 Subaru Outback, rear; 2014-2018 Subaru Forester; 2011-2018 Subaru Forester, rear; 2016-2017 Subaru Crosstrek; 2016-2017 Subaru Crosstrek, rear; 2012-2016 Subaru Impreza, rear; 2012-2016 Subaru Impreza; 2013-2015 Subaru XV Crosstrek; 2013-2015 Subaru XV Crosstrek, rear; and 2011-2013 Subaru Forester, rear. This part cross-references Subaru 44620AC860 for the same application.

Part number 643142 uses a ceramic substrate inside a stainless steel shell to support emissions conversion while maintaining the direct-fit geometry needed for Subaru Legacy, Outback, Forester, Crosstrek, Impreza, and XV Crosstrek exhaust systems. The AP Exhaust Direct Fit Converter product line is built around OE-style dimensions and fitment, which helps simplify replacement on the listed Federal and California emissions applications.

Common Issues This Part Can Address

• Failed catalytic converter efficiency codes on the listed Subaru applications
• Exhaust restriction caused by a worn or damaged converter
• Emissions test failure related to converter performance
• Exhaust leaks at the converter flange connections
• Check engine light concerns tied to catalyst monitoring

Installation Notes and Tips

• Verify the vehicle’s year, model, position, and emissions configuration before ordering.
• Confirm the listed rear or non-position-specific application matches the original converter location.
• Inspect flange surfaces, gaskets, and O2 sensor connections during installation.
• Check local emissions regulations before use; some listed applications are not for sale or use on vehicles licensed in CA, CO, ME, and NY.
• Use the vehicle’s existing exhaust layout and sensor placement as the reference for fitment.

Quality Assurance

AP Exhaust uses automated workstations, spinner welding equipment, and high-speed production lines to build converters to exact OE dimensions and fitment. The ARISTO substrate chemistry used in the Direct Fit Converter line is designed to support efficient catalyst loading and consistent converter performance across the listed Subaru applications.