This exhaust manifold assembly is a high-quality part for Kenworth and Peterbilt with a Paccar MX13 engine. It is designed to fit MX13 EPA17- EPA24 engines, and it is made by Paccar in the United States. The part number is 2440218, and it has not been modified. This item is perfect for those who need to replace their truck's exhaust manifold assembly. This is the updated version to improve longevity. Replaces 2124729 and 2406414.