The Flowmaster 50 Series Delta Flow Mufflers produce the right performance, sound, and feel. This new series of mufflers was designed to be quieter than the Flowmaster 40 Series Mufflers on the inside, while also being milder on the outside of your ride. With the Delta Flow technology you can expect increased horsepower and torque, as well as, the famous deep and mellow Flowmaster sound you’d come to expect.