The Grand Rock Mack Replacement Pipe is a practical solution for DM Models, effectively replacing the Mack Part # 4ME-21408. This replacement pipe offers a reliable and efficient alternative, ensuring seamless functionality for your Mack vehicle. With its high-quality construction and precise fit, this replacement pipe guarantees optimal performance and longevity. Upgrade your Mack with this dependable replacement pipe, designed to meet your specific needs and provide a hassle-free solution.