PCXÖ (Power Chamber Exhaust) technology Chambered high-flow catalyst cartridge designed to increase torque Headers step from 1-3/4" to 1-7/8" to 2" 4" Muffler body Lightweight high grade 304 stainless steel construction Hand TIG welded Fits with standard (non-stretched) saddlebags Include hardware and mounting instructions. EXHAUST 2-1 BR.SS.17+FL