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< > $499.95 Qty :  Bolting on a Factory Fatty will enhance the powerband throughout the range. With increased horsepower and torque, you will not be sacrificing power to gain that factory look and feel. This is the same pipe many of the top supercross and motocross riders are using today.   Used by Yamaha of Troy, Team KTM and Team Yamaha's David Vuillemin. Lighter 20 gauge steel used for the body of the pipe. 19 Gauge steel used for the header portion. Hand pounded seams for smooth flow transitions. Ok