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01-2011 6.6L Duramax Diesel High Flow Updated LH Exhaust Manifold

GM has introduced a new manifold that will flow better then the original OEM unit.  Reduced pinch area near steering shaft for a nearly ideal flow.  Greatly increased flow charecteristics over the original unit. 
 
A great alternative to higher priced after market manifolds. 
 
GM: 12637647

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