3931440 Exhaust Manifold 3978522 3907451 For Cummins 6CT 6CT 8.3 KOMATSU 6D114Exhaust Manifold Tube Feature: 1.Ideal Replacement The exhaust manifold exhausts the exhaust gases produced when running into the atmosphere while reducing noise. Timely inspection and replacement of a new manifold can greatly improve your driving comfort. This is a perfect replacement that has the same quality as the original unit. 2.High quality and special Built to strict OEM quality standards, the exhaust manifold is made of high quality iron,