The Grand Rock DOT/International Harvester Muffler is a reliable and practical choice for your vehicle. With its aluminized construction, it offers durability and longevity. The muffler features an inlet diameter of 3.5" ID and an outlet diameter of 4" OD, ensuring optimal performance. Its body diameter of 8.25" X 11.5" and body length of 32" make it suitable for most DOT/International Harvester models. Additionally, stainless steel options are available upon request. Trust this muffler to enhance your vehicle's exhaust system and enjoy a smooth and efficient driving experience.