2012 Yamaha R1 dual exhaust system is now available at Two Brothers Racing
Performance Specs
Stock TBR Difference
Peak HP 152.5 hp 156.8 hp +4.3 hp
Peak Torque 78.1 ft-lbs 78.7 ft-lbs +0.6 ft-lbs
Max HP Gain - 6.3 hp @ 6200 rpm -
Max Torque Gain - 5ft-lbs @ 6100rpm -
Weight 11.5 lbs 8 lbs -3.5 lbs
Sound 96 db @5000rpm 103 db @5000rpm +7 db
Catalyst yes yes -
O2 Sensor yes yes -
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