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Part #: GM12637647

GM 12637647 Updated Driver Side Exhaust Manifold

2001-2015 GM 6.6L Duramax
Part #: GM12637647
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The GM 12637647 Updated Driver Side Exhaust Manifold for your 2001-2010 GM 6.6L Duramax features a "full bore" unlike the factory exhaust manifold that is "kinked or dented" for additional clearance. The increased flow will "balance" the engine and provide increased spool-up, throttle response and better overall performance. This GM OE part is constructed to the same high quality standards as your factory exhaust manifold. 


  • GM OE Exhaust Manifold 
  • Upgrade On 2001-2010 Duramax Trucks 
2011-2015 LML Note: Because this is the factory manifold that comes on the 2011-2015 LML Duramax it is simply a replacement part for the LML and not an upgrade like the 2001-2010 trucks with the "kinked" exhaust manifold. Exhaust manifold gasket not included. 


  • MFG. Number12637647
  • Manufacturer NameGM / ACDelco
  • Shipping Weight20.00 lb.


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Questions and Answers

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Most Popular Questions

Does this have a hole for an EGT probe like the bd manifold or would I need to drill and tap it for one still?
View Staff Answer 
Nope. This product is an OE Factory Replacement so it would not come with any holes pre-drilled for an aftermarket pyro probe. It would be up to the end user to drill and install one.
Does this manifold have the egt probe port built in?
View Staff Answer 
No, the GM 12637647 Updated Driver Side Exhaust Manifold does not have an EGT port.