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The amazing Two Brothers exhaust systems for the BMW racing street bikes consist of the superb V.A.L.E systems. The V.A.L.E exhaust systems are easy to install, and are availed to you as either a slip-on or full exhaust system. They are suitable for the M- series motorbikes, particularly M-2 and M-5 motorbikes. They are light in weight and improve your horsepower and torque.