Premium 16-gauge steel construction of both tubing and mufflers to provide long lasting performance, Each tube is expanded on one end to allow easy slip fit installation, 2-1/4" mandrel bent tubing is full size throughout the bend for maximum flow and increased power, Two chamber mufflers with twin baffles to reduce drone and interior noise while maintaining a deep powerful tone, Mufflers are offset inlet and center outlet configuration to fit a variety of muscle car and hot rod applications.