An exhaust system includes a first turbine having an inlet that is fluidly coupled to an exhaust conduit; a valve assembly having an inlet port, a first outlet port, and a second outlet port, the inlet port of the valve assembly being in fluid communication with the exhaust conduit; a second turbine having an inlet that is fluidly coupled to the first outlet port of the valve assembly via a first outlet port conduit, and fluidly coupled to an outlet of the first turbine via a first turbine outlet conduit; and a controller operatively coupled to the valve assembly. The valve assembly has a first configuration that blocks fluid communication between the inlet port and the first outlet port, and the valve assembly has a second configuration that effects fluid communication between the inlet port and the first outlet port.