Performance Diesel Parts

High Flow Duramax Driver Side Exhaust Manifold - 2001-2016 GM 6.6L 12637-647PDI

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SKU: G/M12637-647PDI

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High Flow (Driver Side) Manifold for 2001 - 2016 Chevy GMC 6.6L Duramax

Part # 12637-647PDI. GM #: 12624684, 12637647, 97224587

The stock manifold was formed with a pinch/crease to allow for steering column clearance that was never needed. This pinched section has 3 of your 4 cylinders on the driver side running at 80% flow and causes an exhaust pressure imbalance and higher EGT's.

New high flow manifold flows better than the original drivers side manifold. Less restriction to match passager side manifold flow. Greatly increased flow characteristics over the original unit. A great alternative to higher priced after market manifolds.

At this time this kit does not come with a manifold gasket. Currently the highest quality gasket is being made by GM. See the chart below for OEM part numbers.

GM OEM Part # Description
Manifold Gasket
Manifold to Feed Pipe Gasket

WARNING : This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to