Dorman 674-791 Exhaust Manifold - Rear

Dorman 674-791 Exhaust Manifold Overview

Dorman 674-791 is a stainless steel exhaust manifold engineered to match the fit and function of the original manifold on specified vehicles. It is built for the rear position and includes the gaskets and downpipe hardware needed for a complete repair on select Toyota Avalon and Toyota Sienna applications.

Compatible With 2002-2004 Toyota Avalon, rear, 2001-2003 Toyota Sienna, rear, and 2000 Toyota Sienna, rear with California emissions from 4/00. This Dorman exhaust manifold is a direct-fit standard replacement for vehicles that need a precise OE-style exhaust repair.

Key Features

• Stainless steel construction for durable exhaust service
• Metallic gray finish
• Oval port shape
• Oxygen sensor port included
• Heat shield included
• Mounting hardware included
• Gasket or seal included
• Standard replacement grade
• Designed for rear exhaust manifold applications

Detailed Product Description

Dorman 674-791 is built as a replacement exhaust manifold for select Toyota Avalon and Toyota Sienna models. The manifold is precision-engineered to align with the original fit and function, helping restore proper exhaust routing at the rear position. Its stainless steel construction and integrated oxygen sensor port support a clean, serviceable installation on the listed applications. The part number 674-791 is also referenced for OE-style repair planning and catalog lookup.

This part cross-references 1710420030 for the same application.

Common Repair Applications

• Cracked or leaking rear exhaust manifold
• Exhaust noise from manifold gasket failure
• Check engine light concerns related to exhaust leaks or sensor-area sealing
• Damaged manifold heat shielding
• Corrosion-related exhaust sealing issues

Installation Notes and Tips

Verify rear-position fitment before installation and confirm the vehicle is one of the listed Toyota Avalon or Toyota Sienna applications. Inspect the cylinder head and downpipe mating surfaces for damage, and replace worn fasteners or sealing surfaces as needed. The included gaskets and hardware support a complete repair, but proper torque sequence and exhaust alignment remain important for leak-free installation.

Quality Assurance

Dorman manufactures this exhaust manifold as a standard replacement part engineered to match original fit and function on the specified vehicles. Part number 674-791 is built to support a direct-fit repair for the listed Toyota applications.