Dorman 674-778 Exhaust Manifold - Right

Dorman 674-778 Exhaust Manifold for Right Side Repair

This Dorman exhaust manifold is built for direct replacement on select Buick, Chevrolet, GMC, and Saturn vehicles with right-side fitment. It is precision-engineered to match the original manifold’s fit and function, with cast iron construction and the gaskets and downpipe hardware needed for a complete exhaust repair.

Key Features

• Direct replacement exhaust manifold for specified applications
• Cast iron construction for durable exhaust service
• Natural finish with oval port shape
• Includes gasket and seal components for the repair
• Mounting hardware included for installation
• Designed for right-side fitment
• Part number: 674-778

Detailed Description

Dorman 674-778 is an exhaust manifold replacement for vehicles that need a factory-style repair on the right side. It is engineered to match the original manifold’s fit and function on applications such as the Buick Enclave, Chevrolet Traverse, GMC Acadia, GMC Acadia Limited, and Saturn Outlook. The cast iron body supports long-term exhaust service, while the oval port shape and included gasket and flange components help restore a proper seal at the manifold-to-cylinder-head and manifold-to-downpipe connection. If you are replacing a cracked or leaking manifold on a 2008-2017 Buick Enclave right side or a 2009-2017 Chevrolet Traverse right side, this part number 674-778 is built for that type of repair.

This part cross-references OE number 12588987 for the same application.

Common Repair Issues

• Exhaust leak at the manifold
• Ticking or puffing noise from the engine bay
• Cracked or warped original manifold
• Failed manifold-to-downpipe seal
• Check engine light related to exhaust leakage

Installation Notes and Tips

Verify right-side placement before installation and confirm vehicle year, make, and model against the fitment list. Inspect the cylinder-head sealing surface and downpipe connection for damage or corrosion before assembly. Replace worn fasteners and follow the manufacturer’s torque sequence to help achieve a proper seal. This manifold includes the gasket and downpipe hardware specified in the package contents.

Quality Assurance

This Dorman exhaust manifold is manufactured to match original fit and function on specified vehicles. It is built as a regular-grade replacement part for direct repair use.