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Detroit 2008: Audi presents R8 TDI supercar and TT-S (video)

The German manufacturer continues to crank out high-performance cars, and at the Detroit Auto Show, a concept version of its R8 has been presented, powered by a diesel engine. With a turbocharged 6.0-liter V12 that develops 500 horsepower, the oil-burning R8 could reach production is there is demand for it.