BOLTON PREMIERE MUFFLER, ALUMINIZED STEEL, BLACK -- For off-road and race applications; 4 in. thick x 9.75 in. wide x 13 in. case length; 19 in. overall length; 2.25 in. inlet and outlet diameter; Single offset inlet and outlet configuration; Dual-chamber internal construction; With oval casing; Designed for early generation muscle cars; Provides maximum performance and improved flow path radius; Generates more torque and power; Requires welding; With 2-year, unlimited-mileage Bolton Premiere warranty.