Porsche marked its return to the Detroit auto show with a bang by unveiling the motorsports-inspired 918 RSR concept, and--like the 918 Spyder concept revealed last year in Geneva--it was the undisputed star of the show.The advanced gasoline-electric-powered coupe previews a production-based race car under development at Porsche Motorsport, which is eyeing a return to Le Mans in 2012. In addition, the 918 RSR provides clues to the production coupe version of the 918, set to be built alongside the open-top model in 2013.The RSR has a mid-mounted, 4.5-liter, 563-hp V8 powering the rear wheels, enhanced by a kinetic-energy-recovery-system (KERS) flywheel first seen on the 911 GT3 RS hybrid race car, instead of the full-mode hybrid system in the 918 Spyder. The flywheel sits in the passenger area of the cabin and creates energy under braking to power a pair of electric motors integrated into the front axles. At the push of a button, an additional 204 hp is available for eight-second bursts, making the concept four-wheel-drive-capable.

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