The optional Akrapovič Sound Kit enables owners of selected Akrapovič car exhausts to control the system's sound from the cockpit of their vehicle.

Using Akrapovič technology, drivers can easily switch between the quiet mode and a sportier sound. With a receiver to drive the actuators that open or close the valves at the end of the exhaust system, drivers can use the Sound Remote Controller or the new smartphone app (for iOS and Android) to regulate the valves.

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The pictures are for reference.