Originally Posted by Heinz
The AMG GTC I drove last year was brand new and standard. She has diverter valves which can be switched independently of the drive program.

It seems to depend on how the sound is generated. A search on the web turns up some rather confusing results. It seems that a so-called Soundaktuator (or sound generator, "Active Sound") really is prohibited but some sort of flap system can still be installed. It probably depends how it is used.

Peter

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