For the person who wants to maximize the power and mileage potential of their diesel pickup without having to put up with excessive noise inside the truck, these S.O.S. (Single out side) exhaust systems are the perfect choice. Featuring patented Flowmaster core design muffler technology, you can expect a moderate exterior tone and mild to moderate interior sound level. Especially well suited for heavy load and towing applications, these systems deliver! Like all Flowmaster products, the benefits include improved mileage, power, and throttle response. Designed for an easy fit, these systems include all necessary parts and hardware for easy installation.