The Mack Replacement Pipe is a practical and reliable solution for replacing the 4ME-21698 turbo pipe in most DM Mack makes and models. With a 4" diameter and aluminized construction, this pipe offers durability and efficient performance. Sold individually, it fits seamlessly into your existing system, ensuring a hassle-free installation. Trust this high-quality replacement to enhance the functionality of your vehicle without compromising on quality.