Stuttgarter Nachrichten claims it was a 918 but I checked the whole internet and nobody seems to have an evidence for that, so maybe it was a completely different car. The 918 isn't the only hybrid Porsche is working on. 


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RC (Germany) - Rennteam Editor Porsche Panamera Turbo S, Cayenne GTS (958), 991 Turbo S (Oct. 5th), BMW X3 35d (2013)