The Grand Rock Freightliner School Bus 3 Inch Muffler is a practical and reliable choice for Freightliner School Bus models. With its aluminized construction and stainless steel options available, this muffler offers durability and longevity. The 3" ID inlet diameter and 4" ID outlet diameter ensure optimal performance and efficiency. Measuring 11" in body diameter and 36" in body length, this muffler fits seamlessly into the vehicle's exhaust system. Overall, the Grand Rock Freightliner School Bus 3 Inch Muffler is a high-quality product that delivers excellent results.