AP Exhaust 644199 Catalytic Converter - Rear

Direct-Fit Rear Catalytic Converter for Subaru

AP Exhaust Direct Fit Converter 644199 is a Federal / EPA direct-fit catalytic converter built for rear-position replacement on select Subaru applications. It uses a stainless steel body with a ceramic substrate and welded flange connections for a factory-style exhaust repair.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body for exhaust system durability
• Ceramic substrate material
• Rear position replacement
• One inlet and one outlet with welded flange connections
• Includes one O2 sensor port
• Boxed for protection during handling

Fitment Details

Compatible with 2005-2006 Subaru Legacy, rear, Federal and California Emissions; Direct Fit Converter. Compatible with 2005-2006 Subaru Outback, rear, Federal and California Emissions; Direct Fit Converter. AP Exhaust 644199 is a direct-fit replacement for these Subaru Legacy and Subaru Outback rear converter applications.

Product Overview

The AP Exhaust Direct Fit Converter line focuses on application-specific exhaust replacement parts that match the original layout for easier service and proper exhaust routing. Part number 644199 follows that approach with welded flange inlet and outlet connections, a stainless steel shell, and a ceramic catalyst substrate for rear converter service on 2005-2006 Subaru Legacy and Subaru Outback models. AP Exhaust 644199 is built for direct replacement where the original rear catalytic converter has failed or is no longer performing as required.

What It Helps Address

• Check engine light related to catalyst efficiency
• Failed emissions inspection caused by a worn rear converter
• Exhaust leaks at the converter connection points
• Restricted exhaust flow from a deteriorated catalyst
• Noise or odor concerns from a damaged catalytic converter

Installation Notes

Verify rear-position fitment before installation and confirm the vehicle’s emissions configuration matches the listed application. The welded flange inlet and outlet are intended for direct-fit exhaust replacement, and the unit includes one O2 sensor port for the specified application. Professional installation is recommended to ensure proper sealing and sensor placement.

Quality Assurance

AP Exhaust 644199 is a Federal / EPA direct-fit catalytic converter built with a stainless steel body and ceramic substrate for application-specific exhaust repair. It is not CARB certified.