Description 01-15 GMC/Chevrolet 6.6L Duramax Exhaust Manifold Upgrade Left / Drivers Side Manifold Upgrade – No Pinch Dorman 674-731 Lifetime Warranty OE #12637647 Upgrade For The 01-08 – Stock Replacement For 09-15 Fits All 6.6L Engines LB7, LLY, LBZ, LMM, LML
