Maserati Granturismo S In normal conditions the valves are closed, forcing the exhaust gases along a long and tortuous route so that they lose their energy and are emitted outwards with very little noise. This all changes when the "Sport" button is pressed: the valves which were initially closed, open up through a pneumatic control and the flow of exhaust gases is channelled down a route that leads directly to the outside. This provides enthusiasts with a distinctive resonance. If not activated using Sport mode, the pneumatic valves open up above 3000rpm.
BY-PASS VALVE CLOSED
BY-PASS VALVE OPEN
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