Akrapovic Fitting Kit | Mercedes Benz G500 (W463) (12-17) (P-HF1129)This easy to use optional extra gives the driver the opportunity to switch between dual mode settings for either a sporty sound between the deeper and higher frequencies, or the more regular Akrapovic sound. It works by fully controlling the opening and closing of the exhaust valves simply by pushing a button on the Sound Remote Controller or via the downloadable app. The high performance exhaust by Akrapovic gives you absolute freedom to customize