Dorman Exhaust Manifold Kit Driver Side 674-522 — Ductile-Iron, Includes Gaskets & Hardware

This Dorman 674-522 driver-side exhaust manifold kit replaces warped or cracked OE manifolds with a ductile-iron, direct-fit assembly that includes gaskets and mounting hardware.

If a vehicle’s original exhaust manifold has failed because of low-grade cast iron that warped or cracked under heat and stress, the Dorman 674-522 offers a durable aftermarket replacement. Designed as an OE FIX solution, the kit is reverse engineered from the original part so it installs like the factory piece while using improved metallurgical properties for longer service life.

Why choose a ductile iron manifold over the original cast iron?

The Dorman 674-522 is made from ductile iron, which provides better resistance to thermal cycling and mechanical stress than many stock low-grade cast irons. That means fewer cracks and less warpage over time in high-temperature exhaust environments.

• Material upgrade: ductile iron for improved toughness and flexibility under heat
• Reduced failure risk: less prone to stress cracking and deformation
• Consistent performance: maintains flange flatness for better sealing

What comes in the Dorman 674-522 exhaust manifold kit?

This kit includes everything needed to replace the driver-side manifold and reestablish a proper exhaust seal without scavenging parts from the old unit. Hardware and gaskets are provided to simplify installation and reduce the chance of leaks at mating surfaces.

• One driver-side exhaust manifold, prefinished and ready to install
• Manifold gasket and flange gasket for secure sealing
• Three studs and three nuts to replace corroded or damaged fasteners
• Kit packaged to minimize missing components during repair

How straightforward is installation and vehicle fitment?

Dorman designs this OE FIX manifold as a direct-fit replacement, reverse engineered from the original unit so it aligns with factory mounting points. While installation complexity varies by vehicle, the included gaskets and hardware reduce the time and parts required for a proper repair.

• Direct-fit design matches original mounting points and exhaust ports
• Includes necessary gaskets and fasteners to streamline replacement
• Recommended: confirm make, model, and trim in the garage tool for exact compatibility

What quality checks and engineering went into this replacement manifold?

Dorman engineers this replacement in the United States and tests it to ensure it performs to expected standards for fit and durability. The design process focuses on improved materials and manufacturing controls to address common failure modes seen in OE parts.

• Reverse engineered from the original for accurate fitment
• Manufactured with tighter controls to limit casting defects
• Tested for dimensional accuracy and sealing performance

Who this is for: If you own a vehicle that shows exhaust leaks, ticking noises from the engine area, or visible manifold cracking, the Dorman 674-522 driver-side exhaust manifold kit is intended for owners and technicians seeking a durable, direct-fit replacement. It’s especially useful for those who want to replace the entire manifold and related hardware in one service interval, avoid scavenging old, corroded fasteners, and upgrade to a more heat-resistant material without altering original installation methods. Before ordering, verify compatibility with your exact year, make, model and trim using the vehicle fitment tool to ensure a correct match and avoid returns.