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Porsche 918 RSR hybrid concept finally arrives at Detroit

The 2011 NAIAS revealed the mysterious model teased by the Germans from Porsche, namely the 918 RSR Coupe. However, as the officials recently stated, this is just a concept model based on the current 918 Spyder. The Stuttgart-based model offers great performance for the circuit but also hides under the bonnet a hybrid powertrain. The new Porsche 918 RSR concept...