Dorman 674-791 Exhaust Manifold - Rear

Durable Stainless Steel Exhaust Manifold for Toyota Avalon and Sienna

The Dorman 674-791 exhaust manifold is engineered to provide reliable exhaust flow for Toyota Avalon and Sienna models. Constructed from stainless steel with a metallic gray finish, this manifold offers corrosion resistance and long-lasting performance.

• Made from high-quality stainless steel for durability and corrosion resistance
• Oval port shape designed for optimal exhaust flow
• Collector port diameter of 1.025 inches for precise fitment
• Includes oxygen sensor port for seamless integration with vehicle emissions system
• Equipped with a heat shield to protect surrounding components
• Comes with gasket and mounting hardware for a complete replacement
• Standard replacement grade designed to meet OEM specifications

Product Details and Specifications

The Dorman 674-791 exhaust manifold features a metallic gray finish that complements the engine bay while resisting rust and wear. Its oval-shaped ports ensure efficient exhaust gas flow, reducing backpressure and supporting engine performance. The 1.025-inch collector port diameter matches factory dimensions for a precise fit. This manifold includes an oxygen sensor port, allowing for proper sensor installation and accurate emissions monitoring. The 2.235 mm tube wall thickness adds strength and durability under high-temperature conditions. Additionally, the included heat shield helps protect nearby components from excessive heat exposure.

Compatible Vehicles and Applications

This exhaust manifold is compatible with select Toyota models, specifically the Avalon and Sienna. It is designed as a direct replacement part, making it suitable for repairing or upgrading the exhaust system on these vehicles. The part number 674-791 ensures correct fitment and compatibility with the specified models.

• Replacement for damaged or cracked exhaust manifolds on Toyota Avalon
• Restores proper exhaust flow and reduces engine noise in Toyota Sienna
• Addresses exhaust leaks that can trigger check engine lights
• Supports emissions compliance by maintaining oxygen sensor functionality
• Prevents heat damage to engine bay components with included heat shield

Installation Notes and Tips

When installing the Dorman 674-791 exhaust manifold, ensure all old gaskets and seals are fully removed to prevent leaks. The included gasket and mounting hardware should be used to secure the manifold properly. Tighten mounting nuts and studs to manufacturer torque specifications to avoid warping or damage. The oxygen sensor port allows for easy sensor installation without modification. It is recommended to inspect the exhaust system for any additional damage during replacement.

Quality Assurance and Warranty

Dorman manufactures this exhaust manifold to meet standard replacement grade requirements, ensuring reliable performance and durability. The stainless steel construction provides resistance to corrosion and heat-related wear. While specific warranty details are not provided, Dorman parts typically come with a limited warranty covering defects in materials and workmanship.