The Flowmaster 60 Series Delta Flow Mufflers are specifically designed for smaller vehicles. The 60 Series Delta Flow Mufflers will bring the Flowmaster performance to smaller cars and trucks with 4 or 6 cylinder engines. The Delta Flow technology helps reduce interior resonance while providing increased torque and horsepower. The sound you receive from your Flowmaster muffler depends on what tailpipe you put on the Flowmaster 60 Series Delta Flow Mufflers. With a standard tailpipe the 60 Series will output a mellow sound, while a larger tailpipe will create more deep tone.