The Donaldson 51" Round Style 1 Muffler is designed to provide a perfect fit and easy installation. Manufactured with high-quality materials for durability and longevity, This muffler offers excellent noise reduction for a quieter operation. It helps to improve engine performance by reducing backpressure and offers increased fuel efficiency and reduced emissions. It is round in shape and This muffler is the perfect choice for your vehicle. FleetPride is your First Click in Heavy Duty®.