Flowmaster Super 44 mufflers offer distinct advantages over original 40 Series mufflers, while using the same technology as the Super 40 mufflers. The Super 44 mufflers deliver a deep, rich tone with an improved flow path radius, optimum internal flow, and sound control engineering, all created with Flowmaster's Delta Flow technology. The Super 44s are the most aggressive, deepest sounding, highest performing 4 in. case street mufflers that Flowmaster has ever built. These American-made, all-black mufflers exceed OEM specifications for use on street cars, race cars, and sport trucks. They are ideal when dynamic sound, torque, and horsepower improvements are demanded in a smaller high performance muffler. Their maximum performance and improved flow path will generate more torque and power than ever before! If you really want to hear your exhaust system inside as well as outside of your vehicle, then these Super 44 Flowmaster mufflers are for you.