Walker 16861 Catalytic Converter with Integrated Exhaust Manifold

Walker EPA Manifold Converter for Mazda 3

Walker EPA Part Number 16861 is a catalytic converter with an integrated exhaust manifold built for OBDII vehicles and EPA emissions compliance. It combines a stainless steel manifold design with a ceramic substrate to support proper exhaust flow and emissions control on select Mazda 3 applications.

The Walker EPA product line focuses on emissions-compliant replacement parts for import and domestic vehicles. This manifold converter is built for direct-fit service on the listed Mazda 3 applications and uses welded flange connections for a secure exhaust seal.

Key Features

• Walker EPA catalytic converter with integrated exhaust manifold
• Part number 16861 for select Mazda 3 applications
• Stainless steel converter body and manifold construction
• Ceramic substrate material
• 7-bolt welded flange inlet and 2-bolt welded flange outlet
• Pre- and post-catalyst oxygen sensor locations
• Mounting hardware included
• Round inlet and outlet port shapes

Detailed Description

Walker 16861 is designed for 2010-2013 Mazda 3 models listed in the fitment data, including 2010 Mazda 3 with Federal Emission System from 07/01/2010 and 2011-2013 Mazda 3 Federal and California emission models. It is an EPA-compliant manifold converter for vehicles that require an integrated exhaust manifold design, stainless steel durability, and a ceramic catalyst substrate. This part cross-references Gates 51440 for the same application.

For buyers searching for a 2011-2013 Mazda 3 catalytic converter with exhaust manifold or a 2010 Mazda 3 EPA manifold converter, Walker 16861 provides the specified inlet and outlet flange configuration and oxygen sensor placement needed for the listed applications. Part number 16861 is also referenced in interchange data as 641483.

Common Issues This Part Addresses

• Failed catalytic converter emissions testing
• Exhaust leaks at the manifold-to-pipe connection
• Check engine light concerns related to catalyst efficiency
• Restricted exhaust flow from a worn converter assembly
• Damaged or corroded integrated manifold housing

Installation Notes

• Compatible with 2011-2013 Mazda 3, and 2010 Mazda 3 from 07/01/2010 with Federal Emission System.
• Exhaust gasket is recommended for installation.
• Additional part needed to complete installation: 31540.
• Verify emission certification requirements before purchase; not legal for sale or use in California and other CARB-compliant states.
• Confirm oxygen sensor routing and flange alignment before tightening fasteners.

Quality Assurance

Walker EPA converters are built to meet EPA emissions requirements for listed OBDII applications while maintaining the fitment and construction details specified for the vehicle platform. Part number 16861 is engineered for the documented Mazda 3 applications and uses stainless steel and ceramic catalyst materials for service replacement use.