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DHD 300-12637647 Driver Side Exhaust Manifold Kit 2001-2016 Duramax

300-12637647 - 3B
Was: $205.00
Sale: $165.00
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DHD's Replacement Drivers Side Exhaust Manifold Kit is perfect for replacing your cracked, damaged or severely rusted manifold.  Its not uncommon to have hardware break off in the manifold during engine service. Save time and struggle by replacing the manifold. Best of all, our manifold comes standard with the gaskets and hardware to do the job! Don't be fooled into cheap Amazon imitations with fiber gaskets and inaccurate hardware, DHD has the good stuff!


  • (1) Multi-Layer Steel Manifold Gasket
  • (1) Multi-Layer Steel Up Pipe Gasket
  • (1) Drivers OE Full Flow Replacement Manifold (Like LML)
  • (3) DHD Large Flange Up Pipe Bolts
  • New Grade 10.9 DHD Manifold Hardware with Stainless ARP Washers
  • Need a NEW Heat Shield and Hardware? Add it from the menu above!

Note: DHD's supplied hardware is designed to eliminate the factory exhaust manifold studs which are often to rusty or damaged to reuse.


2001-2016 Chevrolet/GMC 6.6L Duramax.

LH Side

Driver Side

Compare to:

GM 12624684,12637647,97224587

Dorman 674-731

BD 1041460

Need the RH side? Check out 300-12624683 Passenger Manifold Kit.



Shipping Information

  • Item Requires Shipping
  • 15.0 lbs.
  • W24.0000” x H6.0000” x L6.0000”
  • Free Shipping

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