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674-731 Dorman Exhaust Manifold Kit (Driver Side) - GMC/Chevy 6.6L Duramax 2001-2016

SKU: DOR674-731
Mftr. Part#: 674-731
UPC: 019495212935
Manufacturer: Dorman Products
Dorman's Exhaust Manifold Kit offers direct replacement upgrade and provide better performance for your 2001-2016 GMC/Chevy 6.6L Duramax truck.

PRODUCT DETAILS (click to expand)

Mftr. Part#674-731
Weight (lbs.):12.00 lbs.
Dimensions:6.00" x 20.00" x 9.00"

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
BrandDorman Products
Product TypeExhaust Manifold
SideDrivers Side
Truck Type/ModelDuramax


Dorman's driver-side Exhaust Manifold Kit was precision engineered and a popular upgrade for your 2001-2016 GMC/Chevy 6.6L Duramax LB7/LLY/LBZ/LMM/LML 2500HD/3500HD/4500HD truck. This kit features a "full bore" design that isn't twisted like the factory manifold on the 2001-2010 models. It has increased the flow, which will set a balance on the engine and help with throttle response for better overall performance on your truck. Dorman's exhaust manifold set is the perfect replacement for reliability and ease of mind.


  • Direct replacement
  • Upgrade on 2001-2010 Duramax trucks
  • Replaces GM OE Part#: 12624684, 12637647, 97224587


  • Because this is the factory manifold that comes on the 2011-2015 LML it is simply a replacement part and not an upgrade like the 2001-2010 trucks.