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When your high-mileage Chevy or GMC truck starts ticking on the driver side, showing soot marks, smelling like exhaust, or driving rough from broken manifold hardware, SPELAB stainless driver-side manifold restores proper sealing and exhaust flow with a complete repair-focused replacement built for daily, towing, and work use.

The SPELAB driver side exhaust manifold is built for select 1999–2020 Chevrolet, GMC, and General Motors applications with 4.8L, 5.3L, 6.0L, and 6.2L engines. It is commonly cross-referenced with Dorman 674-522 and OE numbers including 101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, and 12686303.

Reference Note: Dorman 674-522 and the listed OE numbers are used for fitment reference only. This is a SPELAB product, not a Dorman-branded product.

Why Replace Your Driver Side Exhaust Manifold?

A damaged or leaking exhaust manifold can affect more than sound. Exhaust leaks near the cylinder head can reduce exhaust sealing efficiency, create ticking or tapping noises, and allow exhaust gases to escape before they move properly through the exhaust system. Replacing the damaged driver-side manifold helps restore a tighter exhaust path and supports more consistent engine operation.

• Helps replace a cracked, leaking, warped, rusted, or damaged driver-side exhaust manifold
• Supports proper exhaust flow from the cylinder head into the exhaust system
• Helps reduce ticking noises, soot marks, and exhaust smell caused by manifold leaks
• Useful for high-mileage Chevy, GMC, and GM trucks or SUVs used for daily driving, towing, or work use
• Designed as a compatible replacement option for applications commonly cross-referenced with Dorman 674-522
• Includes necessary installation accessories for a more complete replacement setup

Key Features and Benefits

• Driver-Side Replacement: Designed for the driver side / left side on compatible Chevrolet, GMC, and GM applications.
• Stainless Steel Construction: Built for durability, heat resistance, and long-term use in exhaust manifold applications.
• Tubular Manifold Design: Helps support smoother exhaust movement compared with restrictive or aging factory-style manifolds.
• Equal-Length Runners: Designed to help balance exhaust pulses and support more consistent exhaust flow.
• Mandrel-Bent Pipes: Helps maintain a smoother internal exhaust path through bends for improved flow efficiency.
• Pressed Head Flanges: Head flanges are flattened by hydraulic press to help improve sealing surface contact and reduce the risk of exhaust leaks.
• Chrome-Plated Flanges: Helps increase corrosion resistance and surface hardness in high-heat operating conditions.
• TIG-Welded Joints: All joints are TIG welded to help resist cracking, vibration fatigue, and long-term wear.
• Installation Accessories Included: Comes with the necessary accessories for installation, making it a more complete repair-focused replacement option.

Factory-Style/OEM vs. SPELAB vs. High-End Custom Manifolds

Not every Chevy or GMC owner needs the same exhaust manifold. Some drivers only need a basic factory-style repair, while others are building a high-budget custom performance setup. The SPELAB driver side exhaust manifold is positioned as a practical upgrade-style replacement: stronger flow-focused construction than a basic repair part, without the higher cost or complexity of a full custom race manifold.

Option	Best For	Main Advantage	Limitations
Factory-Style/OEM Replacement Manifold	Stock vehicles needing a basic repair	Restores factory-style exhaust function	May not focus on improved exhaust flow, upgraded construction, or performance support
SPELAB Driver Side Exhaust Manifold	Daily drivers, towing vehicles, work trucks, high-mileage SUVs, and repair-focused builds	Stainless steel construction, tubular design, equal-length runners, mandrel-bent pipes, chrome-plated flanges, TIG-welded joints, and included installation accessories	Not a full custom race manifold for extreme horsepower builds
High-End Custom or Race-Focused Manifold	Dedicated performance builds, custom exhaust setups, and high-budget projects	Can be designed around specific horsepower, exhaust-flow, or sound goals	Usually costs more, may require custom fabrication, and may be unnecessary for normal repair, towing, or daily use

Bottom Line: For many compatible Chevrolet, GMC, and GM owners, SPELAB offers a practical balance of fitment, durability, exhaust flow, included accessories, and real-world repair value. It is a strong option for drivers who want more than a basic factory-style replacement but do not need a costly custom performance manifold.

Best For

• Driver-Side Exhaust Manifold Repairs: A practical replacement option for compatible Chevrolet, GMC, and GM applications.
• High-Mileage Trucks and SUVs: Useful when the original manifold is cracked, leaking, warped, rusted, or causing exhaust leaks.
• Daily Drivers and Family Vehicles: Helps restore normal exhaust sealing, sound, and drivability.
• Towing and Work Use: Suitable for vehicles exposed to repeated heat cycles, load, and demanding driving conditions.
• DIY Repair Projects: A good option for experienced DIY owners replacing a leaking driver-side manifold.
• Cross-Reference Replacement Searches: Useful for buyers looking for a SPELAB-compatible option related to Dorman 674-522 or OE numbers such as 12556078, 12562235, 12564155, and 12602037.

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Fitment for 1999–2020 Chevrolet GMC 4.8L 5.3L 6.0L 6.2L

Years	Make	Engine	Position
1999–2020	Chevrolet / GMC / General Motors	4.8L / 5.3L / 6.0L / 6.2L	Driver Side / Left Side

Reference / Interchange Numbers: 101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, 12686303, Dorman 674-522

Fitment Note: Please confirm your vehicle year, make, model, engine, driver-side position, and reference part number before ordering. Fitment can vary by engine, trim, production date, body style, and exhaust configuration.

Need options for other vehicle applications? Click to view more SPELAB exhaust manifold.

Exhaust Manifold Specifications

Specification	Details
Brand	SPELAB
Product Type	Driver Side Exhaust Manifold
Application	1999–2020 Chevrolet / GMC / General Motors 4.8L, 5.3L, 6.0L, 6.2L applications
Position	Driver Side / Left Side
Cross-Reference	Compatible reference for Dorman 674-522 applications
OE / Interchange Numbers	101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, 12686303
Application Type	Automobile Exhaust Manifold
Material	Stainless Steel
Design	Tubular manifold design
Runner Design	Equal-length runners
Pipe Construction	Mandrel-bent pipes
Flange Treatment	Hydraulic-pressed head flanges with chrome plating
Welding	TIG-welded joints
Included Accessories	Necessary installation accessories included
Certificate	ISO9001:2000

Installation Notes for Experienced DIY Owners

• Designed for experienced DIY installation or professional installation, depending on your tools, mechanical skill level, and the condition of the existing exhaust hardware.
• Confirm that this is the correct driver-side / left-side manifold before removing your original part.
• Match the reference numbers and compare product images with your current exhaust manifold before installation.
• Check that all included installation accessories are present before starting the job.
• Older trucks and SUVs may have rusted, seized, or heat-cycled studs, nuts, and bolts, so allow extra time for removal and preparation.
• Inspect the gasket surface, cylinder head sealing area, mounting hardware, and nearby exhaust connections during installation.
• Use proper torque procedures and follow the vehicle service manual where applicable.
• Always allow the engine and exhaust system to cool completely before removal or installation.

Symptoms of a Worn or Leaking Exhaust Manifold

• Ticking or tapping noise near the driver-side manifold area
• Visible soot marks around the manifold or gasket area
• Exhaust smell near the engine bay or cabin area
• Increased exhaust noise during acceleration
• Broken or rusted manifold studs or hardware
• Cracked, warped, or heavily corroded manifold surface
• Reduced drivability caused by exhaust leaks near the engine

Important Fitment and Use Note

This product is intended for compatible driver-side Chevrolet, GMC, and General Motors applications listed above. Dorman 674-522 and OE numbers are provided for fitment cross-reference only. This product is not manufactured by, endorsed by, or sold as a Dorman-branded product. Fitment, installation, and final results may vary depending on vehicle condition, engine configuration, production date, exhaust setup, and installation quality. Always confirm compatibility, reference part numbers, and driver-side position before ordering.

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FAQ About This Driver Side Exhaust Manifold

Q: Is this manifold a genuine Dorman 674-522 part?
A: No. This is a SPELAB driver side exhaust manifold designed as a compatible replacement option for applications commonly cross-referenced with Dorman 674-522. The Dorman number is used for fitment reference only.

Q: Is this manifold for the driver side or passenger side?
A: This exhaust manifold is designed for the driver side / left side on compatible Chevrolet, GMC, and GM applications.

Q: What vehicles does this driver side exhaust manifold fit?
A: It is designed for select 1999–2020 Chevrolet, GMC, and General Motors applications with 4.8L, 5.3L, 6.0L, and 6.2L engines. Always confirm your exact year, model, engine, position, and reference number before ordering.

Q: What OE or interchange part numbers does this manifold reference?
A: Reference numbers include 101261, 663017, 12556078, 12562235, 12562330, 12564155, 12571678, 12602037, 12610962, 12616285, 12686303, and Dorman 674-522.

Q: What is this exhaust manifold made from?
A: This SPELAB exhaust manifold is made from stainless steel according to the listed product specifications.

Q: Does this exhaust manifold include installation accessories?
A: Yes. This product includes the necessary installation accessories for a more complete replacement setup. Please check the package contents and product images before installation.

Q: Can I install this exhaust manifold myself?
A: Many experienced DIY owners can install this manifold with the right tools, preparation, and mechanical knowledge. Because older Chevrolet and GMC vehicles may have rusted or seized exhaust hardware, allow extra time and inspect the studs, nuts, gasket surface, and nearby exhaust connections before installation.

Q: What problem does this exhaust manifold help solve?
A: It helps replace a cracked, leaking, rusted, warped, or damaged driver-side exhaust manifold and can help reduce ticking noises, soot marks, exhaust smell, and exhaust leaks near the engine.

Q: Does this manifold require tuning?
A: No. A standard driver-side exhaust manifold replacement does not generally require tuning.