Looking for a versatile muffler with lots of performance applications? The Pro Series control technology to the street and racetrack. These round-cased mufflers deliver ground breaking sound control while delivering maximum power and exhaust system efficiency. The full-size Pro Series mufflers sound great on gasoline or diesel truck or racing applications. The Pro Series “shorty” mufflers are a terrific choice for muscle cars and other performance vehicles where great sound is desired.