Interesting video from Sport Auto. Keep in mind that German cars usually have a speedo error of 10-15 kph at top speed and judging by the video, I actually think that the 991 Turbo S is speed limited to 318 kph.

http://www.youtube.com/watch?v=HoKst5KKtdQ


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RC (Germany) - Rennteam Editor Porsche 991 Turbo S, Cayenne GTS (958), BMW X3 35d (2013)