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The optional Akrapovic Sound Kit enables owners of selected Akrapovic exhaust systems to control the sound of the system from the cockpit of their car.
Using Akrapovic technology, drivers can easily switch between the quiet mode and a sportier sound.
With the use of 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.
Check out the rest of the site for other BMW M3 performance upgrades.
The best exhaust system for BMW F80 M3 is at MGC