Dorman 674-918 Exhaust Manifold - Rear

Dorman 674-918 Exhaust Manifold

This Dorman exhaust manifold is precision-engineered for a direct replacement on specified vehicles, with fit and function matched to the original part. Built from cast iron with a natural finish, it includes the gasket, flange, heat shield, and downpipe hardware needed for a complete rear exhaust manifold repair.

Key Features

• Cast iron construction for durable exhaust service
• Natural finish
• Irregular port shape
• Heat shield included
• Gasket or seal included
• Mounting hardware included
• Package contents: exhaust manifold, manifold gasket and flange, studs, and nuts

Detailed Description

The Dorman 674-918 exhaust manifold is built to replace the rear manifold on select GM vehicles with a direct-fit design that follows the original equipment layout. It is engineered to match the factory fit and function for applications such as the 2004-2006 Pontiac Montana, 2004-2005 Chevrolet Impala, and 2005-2006 Saturn Relay. This part cross-references 101494 and 12578348 for the same application.

Use this exhaust manifold when servicing a rear manifold on vehicles including the 2004 Buick Rendezvous, 2005 Buick Century, and 2004 Pontiac Aztek. The cast iron body helps provide the strength expected in exhaust service, while the included gasket, flange, studs, nuts, and heat shield support a complete repair at the manifold-to-downpipe connection.

What It Helps Repair

• Exhaust leaks at the rear manifold
• Cracked or warped manifold surfaces
• Failed gasket sealing at the manifold flange
• Broken or missing manifold studs and nuts
• Heat shield damage at the exhaust manifold area

Installation Notes and Tips

Verify rear-position fitment before installation. This part is listed for 2004-2007 Buick Rendezvous, 2005-2006 Buick Terraza, 2005-2006 Chevrolet Uplander, 2004-2006 Pontiac Montana, 2005-2006 Saturn Relay, 2005 Buick Century, 2004-2005 Chevrolet Impala, 2004-2005 Chevrolet Monte Carlo, 2004-2005 Pontiac Grand Am, 2004 Oldsmobile Alero, 2004 Oldsmobile Silhouette, and 2004 Pontiac Aztek. Inspect the exhaust flange, fasteners, and mating surfaces before assembly to help ensure a proper seal.

Quality Assurance

Dorman manufactures this exhaust manifold to match the original manifold’s fit and function on specified vehicles. The part is built with the listed materials and included sealing and mounting components to support a complete repair.