Dorman 674-642 Catalytic Converter with Integrated Exhaust Manifold

Dorman 674-642 Catalytic Converter Manifold

Dorman 674-642 is a catalytic converter with an integrated exhaust manifold for specific Lexus and Toyota applications. It is built as a direct OE-style replacement for vehicles that use a manifold converter design, with a stainless steel converter body and included inlet gasket and outlet flange hardware.

Key Features

• Catalytic converter with integrated exhaust manifold for a manifold converter layout
• Stainless steel converter body for exhaust system durability
• Natural finish with regular grade construction
• Inlet gasket included for the exhaust manifold connection
• Outlet mounting hardware included for installation at the flange
• Irregular inlet port shape to match the original equipment design
• Not CARB certified

Application Details

This Dorman 674-642 exhaust manifold catalytic converter is engineered to match the original equipment configuration on select Lexus GS300, Lexus IS300, Lexus SC300, and Toyota Supra models. It cross-references Walker Exhaust 16354 and Continental 49283 for the same application. Fits 2000-2005 Lexus GS300, 2001-2005 Lexus IS300, 1998-2000 Lexus SC300, 1998-1999 Lexus GS300, and 1998 Toyota Supra.

Common Repair Uses

• Replacing a cracked or leaking exhaust manifold converter assembly
• Restoring exhaust flow after catalyst failure or restriction
• Addressing exhaust odor caused by a damaged converter housing
• Repairing flange or gasket sealing issues at the manifold connection
• Replacing a rusted or heat-damaged OE-style manifold converter

Installation Notes

Verify the vehicle year, make, model, and emissions configuration before ordering. This part is not CARB certified, so it is not for California-compliant applications. Inspect the mating surfaces, exhaust fasteners, and downstream exhaust components before installation to help ensure a proper seal and correct fitment on Lexus GS300, Lexus IS300, Lexus SC300, and Toyota Supra applications.

Quality Assurance

Dorman manufactures this part as a precision-engineered replacement for specific OE applications. The stainless steel construction and application-specific design support a direct-fit repair for the listed vehicles.