Shop for Isuzu NPR/HD DPF & Mufflers: Quiet, Durable, and Built to Last. Upgrade your Isuzu NPR or HD with high-quality mufflers and exhaust parts that deliver top performance and durability. Made from tough aluminized and stainless steel, these components provide excellent sound dampening and corrosion resistance. Whether you need a replacement muffler, custom exhaust tip, or a full system, we've got options in sizes from 4-inch to 10-inch diameters and lengths up to 51 inches. Boost your truck's look, sound, and functionality with premium exhaust solutions that are built to perform!