Method and system for controlling pressure in a tuned pipe of a two stroke engine

An engine system comprising:

• a two stroke engine;
• an exhaust manifold coupled to the two stroke engine;
• a tuned pipe coupled to the exhaust manifold;
• a stinger pipe coupled to the tuned pipe;
• a common housing having a common wall dividing the common housing into a first silencer and a second silencer;
• a turbocharger coupled to the stinger pipe, said turbocharger comprising a turbine inlet coupled to the stinger pipe and a turbine outlet coupled to the first silencer;
• said first silencer coupled to the tuned pipe through the stinger pipe, a first exhaust path to atmosphere is provided sequentially from the tuned pipe through the stinger pipe, through the turbocharger and through the first silencer;
• said second silencer coupled to an exhaust bypass valve and atmosphere, said second silencer having a second exhaust path completely separated from the first exhaust path of the first silencer by the common wall, said second exhaust path communicating exhaust gasses between the exhaust bypass valve and atmosphere;
• and
• the exhaust bypass valve bypassing exhaust away from the stinger pipe to the second silencer.