Features 16-gauge steel construction throughout1 -3/4'' headpipes flow into 2 -1/4'' muffler bodies for increased flow and improved performanceDesigned to increase low-end torque and produce a deep, throaty exhaust noteIncludes heat shields for the headers, mounting brackets, hardware, O2 sensor ports and plugsMade in the U.S.A.Includes 12 mm and 18 mm O2 sensor ports