The Mack Replacement Pipe is a practical and reliable solution for replacing the 4ME-21598 pipe in your Mack truck. With a 4" diameter and made from aluminized material, this DM model pipe fits most DM Mack makes and models. It is sold individually and is designed to fit the OEM part number. This replacement pipe offers durability and functionality, ensuring optimal performance for your Mack truck. Upgrade your exhaust system with this high-quality replacement pipe for improved efficiency and longevity.