Two Brothers S1-R Exhaust on Yamaha FZ-09
Shortly after the release of the Yamaha FZ-09, which offers a powerful naked sportbike at a low price point, Two Brothers Racing immediately went to work.
TBR recently released its all-new S1-R exhaust for the FZ-09. The bike strips the Yamaha of weight, and adds noticeable horsepower to the 850cc triple – 8 horsepower at peak rpm.
The exhaust was built with a lightweight spiral-wound perforated core, machined spring-retained connection and carbon fiber material. Check out the video above for further details. For further information, visit Two Brothers Racing.

Has it lost any h.p. or torque between 3000-8000K, which is where I’m at most of the time on the street?
Hey Frank,
From the looks of the graph on the video, it appears the power continues to gradually build throughout that range as it does with the stock pipe. Only difference is more power throughout…