Like all Two Brothers products, the Cyclone Series exhaust systems were developed to surpass what is offered on the market today. Slip-on exhaust. Super lightweight 3.75" round traditional carbon fiber muffler. 2.25" perforated inner core for maximum airflow and deep aggressive tone. Unparalleled sound and performance. Old school retro Two Brothers skull logo badge. Spiral-wound perforated core. Black out clamp. Optional dB killer insert available (sold separately). One-year manufacturer's warranty. Handmade in U.S.A.