Once the exhaust system is installed, the turbo mounts to the four holes around the exhaust system outlet. A hole was cut in the wheelwell below the turbo to help cool the unit. Steel piping connects from the turbo to the throttle body. The braided steel hose is part of the wastegate system. When the boost pressure gets too high, the actuator connected to the lower end of the hose opens the wastegate, allowing some of the exhaust gas to bypass the turbine wheel. This, in turn, reduces the amount of boost generated by the compressor wheel.