Like all of our products, our full exhaust system was developed to surpass what is offered on the market today. Engineered to compliment the quality and performance of your bike manufacturer, this handcrafted system delivers unparalleled sound and performance for the ultimate race experience. Super lightweight 3.75" round traditional CF 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 One-year manufacturer's warranty