Bi-color is not standard on the Turbo (are you using the German configurator?). I did all the calculation again and I come up with under 5k EUR difference, sorry.
Same options...Turbo and Turbo S.
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RC (Germany) - Rennteam Editor Porsche 991 Turbo S (Sept. 2013), Cayenne GTS (958), BMW X3 35d (2013)