Dorman 673-642 Catalytic Converter with Integrated Exhaust Manifold

OE-Style Manifold Converter for Lexus

Dorman 673-642 is a catalytic converter with an integrated exhaust manifold built for specific Lexus applications. It is engineered to match original equipment fit and function, with a stainless steel converter body and CARB certification for emissions compliance where required.

Key Features

• Integrated exhaust manifold and catalytic converter design
• Stainless steel converter body for corrosion resistance
• CARB certified with Executive Order D-665-23
• Includes inlet gasket and outlet mounting hardware
• Natural finish and regular grade construction
• Direct replacement for select Lexus GS300 and Lexus IS300 applications

Detailed Description

This Dorman manifold converter is a direct-fit replacement for select 2000-2005 Lexus GS300 and 2001-2005 Lexus IS300 models. The integrated design replaces the exhaust manifold and catalytic converter assembly in one unit, helping restore proper exhaust routing and emissions control on the specified vehicles. Part number 673-642 is also referenced by cross-reference applications such as 1714046080 and MagnaFlow 452843.

Built with a stainless steel converter body and an irregular inlet port shape to match the original equipment layout, this unit is intended for drivers needing a CARB-compliant replacement for Lexus GS300 and Lexus IS300 exhaust repairs. The included inlet gasket, output flange, and outlet mounting hardware support a complete installation on the listed applications.

What This Part Helps Address

• Failed catalytic converter efficiency on the listed Lexus models
• Cracked or leaking exhaust manifold assembly
• Exhaust leaks at the manifold-to-pipe connection
• CARB emissions compliance issues on approved applications
• Check engine light concerns related to exhaust aftertreatment faults

Installation Notes and Tips

Verify vehicle year, model, and emissions requirements before installation. This part is positioned as N/A in the fitment data and is intended for the specific Lexus GS300 and Lexus IS300 applications listed below. Inspect the mating surfaces, replace damaged fasteners as needed, and confirm proper sealing at the inlet and outlet connections during installation.

• Fits 2000-2005 Lexus GS300, N/A
• Fits 2001-2005 Lexus IS300, N/A

Quality Assurance

Dorman manufactures this manifold converter as an OE-style replacement for the specified vehicles. It is CARB certified and carries Executive Order D-665-23 for the applications listed, supporting emissions-compliant service where required.