2015 Cummins ISX12 G, Truck Tractor, Engine Assys, Fits to: Mack CXU633T, (Used) 2014 Cummins ISX12-G, ENGINE ASSEMBLY- Family Number: ECEXH0729XBA, Displacement: 11.9L, Horsepower: 400, Ar.No./CPL: 3647, ECS: HO2S, PCM, TWC, Fuel: CNG, For more information about this item, give us a call. We ship Worldwide! (CRG HEAVY TRUCK PARTS) 929 W PULASKI HWY ELKTON, MD 21921, Horse Power 400, Serial# N/A, Truck Year 2015 1M1AW27Y5FM010261