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The synthesis of brute power and track-tuned agility, the Firebolt XB12R puts 103 horsepower and 84 f t. lbs. of torque in its rider's hand. The Buell InterActive Exhaust system utilizes a valve in the dual- chamber muf fler that is controlled by the ECM and adjusts exhaust flow according to riding conditions to smooth torque delivery and optimize engine power.