1.75” to 1.875” high-flow 16-gauge stepped primary headers with an obround 1.875” crossover4”-diameter, 16-gauge absorptive mufflers with 2” inlets and removable billet tips2.50,” 220°, 16-gauge heat shields18mm and 12mm O2 bungs welded into the primariesHeavy-duty, AccuSeal® reaction-block header-to-muffler clamps includedRemovable insert for ultimate sound control