Dorman 673-838 Catalytic Converter with Integrated Exhaust Manifold - Front

OE-Style Manifold Converter for Mazda 6

Dorman 673-838 is a catalytic converter with integrated exhaust manifold for the front position on select 2003-2004 Mazda 6 models. It is built to match original equipment dimensions and mounting points for a direct replacement on CARB-compliant applications.

With a stainless steel converter body, round inlet port, and included gaskets, this manifold converter is built for a precise exhaust seal and proper fitment. Dorman 673-838 also carries California Air Resources Board certification, making it a direct option for regulated emissions applications.

Key Features

• Part number: 673-838
• Catalytic converter with integrated exhaust manifold
• Compatible with 2003-2004 Mazda 6, front
• CARB certified with Executive Order D-665-23
• Stainless steel converter body
• Round inlet port shape
• Includes exhaust manifold, 1 input gasket, and 1 output gasket
• Outlet mounting hardware included

Detailed Description

This Dorman manifold converter is engineered as an OE-style replacement for the front exhaust position on the 2003-2004 Mazda 6. It is designed around the original equipment layout so the exhaust manifold and catalytic converter function as a single assembly, helping restore proper exhaust routing and emissions control. The 673-838 is a practical choice for drivers needing a CARB-compliant replacement for the Mazda 6 front catalytic converter with integrated manifold.

This part cross-references 452863 and AJ572050XC for the same application.

What It Helps Address

• Failed front catalytic converter on a 2003-2004 Mazda 6
• Cracked or leaking exhaust manifold assembly
• Emissions test failure related to converter efficiency
• Exhaust leaks at the manifold or outlet connection
• Check engine light concerns tied to exhaust system faults

Installation Notes and Tips

Verify vehicle year, make, model, and front-position fitment before installation. Replace worn gaskets during service and confirm all mounting surfaces are clean and flat for proper sealing. Because this is a CARB-certified emissions component, confirm local emissions requirements before installation on a Mazda 6.

Quality Assurance

Dorman manufactures this catalytic converter with integrated exhaust manifold to match original equipment specifications for the listed application. CARB certification and Executive Order D-665-23 provide emissions compliance documentation for approved use on the specified Mazda 6 models.