The Buddy Club Spec II is a complete circuit racing cat-back exhaust system. A racing spec muffler is a light weight and highly efficient muffler that is made to perform for circuit/track use. In its street version, to optimize torque in the low to mid speed range, it is equipped with an efficient middle silencer (resonator). Racing Spec Muffler were designed for high performance as well as meeting sound level standards. With its deep throaty tone, it echo's of it's racing linage.