The CST 11 is the second Quattrini 210 TV expansion chamber exhaust to come to market. The CST 11 is similar to the CST 5 and 6 pipes in it been an exhaust that allows the engine to rev for longer but still producing good BHP and torque at low RPM. This exhaust produces maximum BHP and torque around 5000 RPM but holds it to around 8000. Not only that but they are Hand Made here in Britain! Looking for the only expansion exhaust on the market and coming from a developer that produces some of the best exhausts on the market then this is pipe for you!