Dorman Exhaust Manifold Kit — Driver Side 674-522, Ductile Iron Direct-Fit Replacement with Gaskets & Hardware

Dorman 674-522 is a complete driver-side exhaust manifold replacement kit built from ductile iron and supplied with the gaskets and hardware required for a straightforward OE-style swap.

If your vehicle's original exhaust manifold has warped or developed cracks, this Dorman OE FIX kit offers a durable, direct-fit replacement engineered to resist heat-related failure. Manufactured using higher-grade ductile iron, the part is designed to better withstand thermal cycling and vibration than many lower-grade original castings. The kit includes the manifold itself plus the matching manifold gasket, a flange gasket, three studs and three nuts so you get everything needed for reassembly without sourcing extra components.

How does the Dorman 674-522 improve durability compared with the original part?

The replacement manifold is produced from ductile iron, a material choice that increases resistance to cracking and distortion under repeated heating and cooling. Dorman’s engineering focuses on material performance and structural integrity to extend service life under exhaust-system stress. Components are tested in U.S.-based engineering labs to validate fit and durability before release.

• Ductile iron construction resists warping and cracks
• Designed to handle repeated thermal cycling
• Engineered and tested in the United States for reliability

Will this kit fit my vehicle and what comes in the box?

The kit is a direct-fit replacement reverse-engineered from the original equipment part to align with OE mounting points and ports. To confirm compatibility, use your vehicle’s make, model and trim in Dorman’s fitment tool or the seller’s garage lookup before purchase. The package contains the manifold, a manifold gasket, a flange gasket, three studs and three nuts so you can complete the installation without needing additional hardware.

• Manifold engineered for exact bolt pattern and port alignment
• Included manifold gasket and flange gasket for sealing
• Three studs and three nuts for secure mounting

How difficult is installation and what should I prepare for?

Installation complexity is comparable to other exhaust manifold swaps and typically requires moderate mechanical skill and basic tools. Expect to remove the old manifold, clean the mounting surface, install supplied studs and gaskets, then torque fasteners to factory specifications. If rusted fasteners or limited access are present, plan additional time and possibly penetrating lubricant or specialty sockets.

• Direct-fit design reduces modification and alignment work
• Basic hand tools and torque wrench recommended
• Allow extra time where fasteners are corroded or obstructed

What performance or reliability improvements can I expect?

By replacing a compromised manifold with this ductile iron OE FIX part, you should reduce the likelihood of future leaks and prevent exhaust routing issues caused by warped or cracked originals. Reliable sealing and consistent fit help maintain exhaust flow and prevent exhaust leaks that can affect emissions or noise levels. Keep in mind this is a hardware replacement to restore proper function rather than a performance-modifying upgrade.

• Improved sealing reduces exhaust leak risk
• Better material resilience lowers chance of repeat failure
• Restores intended exhaust routing and fitment

Who is this for: The Dorman 674-522 kit is aimed at vehicle owners and independent mechanics who need a dependable, direct-fit driver-side exhaust manifold replacement without sourcing multiple parts separately. It’s well suited for those replacing a warped or cracked OEM manifold and who want replacement hardware and gaskets included. To ensure proper fitment, verify your exact vehicle application using the online garage tool or parts lookup before ordering.