Vance & Hines Exhaust Big Radius 2-To-1 Black for Harley Dyna Traditionally viewed as the kind of pipe merely designed for performance, Big Radius 2-into-1 breaks the mold, delivering white-knuckle performance with the style that has won over the motorcycle aftermarket. Incorporating blue-proof technology across the entire length of the pipe, Big Radius 2-into-1 will keep its showroom finish whether at the dragstrip or on the boulevard. Includes mounts for factory O2 Sensors. Designed and produced in the USA.