AP Exhaust 644164 Catalytic Converter - Rear

OE-Fit Catalytic Converter for Mazda 3

AP Exhaust 644164 is a Federal / EPA direct-fit catalytic converter built for rear-position applications on select 2010-2013 Mazda 3 models. It uses a stainless steel body and OE-style 2-bolt welded inlet and outlet connections for a direct replacement on the specified vehicle configurations.

Built to match OE dimensions and fitment, this AP Exhaust catalytic converter is engineered for the rear exhaust location on the Mazda 3 and supports proper exhaust flow and emissions system function. Part number 644164 is also referenced for the same application as LFE42055XB.

Key Features

• Federal / EPA direct-fit catalytic converter
• Stainless steel body construction
• OE-style 2-bolt welded inlet and outlet connections
• Built to exact OE dimensions for specified fitment
• Rear position application for select Mazda 3 models
• Includes inlet and outlet hardware and gaskets as listed in the product data

Detailed Description

AP Exhaust 644164 is engineered for 2010-2013 Mazda 3 rear exhaust applications, including direct-fit complete assembly configurations and PZEV emissions variants listed in the fitment data. The converter uses AP Emissions Technologies manufacturing methods and ARISTO substrate chemistry to support efficient catalyst loading while maintaining OE-style dimensions and fitment. The stainless steel body adds durability for underbody exhaust service, and the welded 2-bolt inlet and outlet design supports a factory-style installation on the specified Mazda 3 configurations.

This part number, 644164, is a practical replacement choice when servicing a rear catalytic converter on a Mazda 3 with Federal or California emissions configurations listed below. It cross-references Monroe Shocks & Struts (e.g., LFE42055XB) for the same application.

What This Part Helps Address

• Failed rear catalytic converter on a 2010-2013 Mazda 3
• Emissions-related diagnostic trouble codes tied to catalyst efficiency
• Restricted exhaust flow from a deteriorated converter assembly
• Factory-fit replacement needs for rear exhaust service
• Replacement of a damaged or corroded OE-style converter assembly

Installation Notes and Fitment

• Fits 2010-2013 Mazda 3, rear — Direct Fit; (PZEV, Complete Assembly); Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.; Includes Resonator Pipe
• Fits 2010-2013 Mazda 3, rear — Direct Fit; Complete Assembly; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.
• Fits 2010-2013 Mazda 3, rear — Direct Fit; With PZEV Emissions, Complete Assembly; Federal and California Emissions. Not For Sale or Use on vehicles licensed in the state of CA, CO, ME & NY. Restrictions may apply in other states. Check with your state authority for details.

Verify the vehicle’s emissions configuration before ordering, since the listed applications include Federal and California emissions variants with state-use restrictions noted by the manufacturer. Confirm exhaust flange style and rear-position application against the existing assembly before installation.

Quality Assurance

AP Exhaust builds this converter using automated workstations, spinner welding equipment, and high-speed production lines to maintain OE dimensions and consistent fitment across the listed Mazda 3 applications. The product is manufactured to support industry-standard emissions service requirements for the specified Federal / EPA direct-fit use case.