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2012 Mercedes-Benz SLK AMG breaks cover

Mercedes-Benz is adding even more mojo to the SLK roadster for 2012, launching the most powerful version of its long-running sports car. Dressed in AMG trim, the SLK gets an even angrier look and a slew of performance enhancements. But that’s all overshadowed by one omnipotent figure: the 415 hp derived from the naturally aspirated V8.

GM delays innovative new diesel truck engine

General Motors' deteriorating financial situation has caused the company to delay one of the most advanced engines that it has ever designed, a 4.5-liter diesel for light-duty trucks. "We have to make tough decisions right now," GM Powertrain spokeswoman Susan Garavaglia said. Truck enthusiasts were eagerly awaiting the engine, which would have started production next fall at GM's plant in Tonawanda, N.Y.

Pontiac SD-290

According to GM, the Pontiac SD-290 concept is "Designed to evoke the emotions of classic sports cars". Introduced at SEMA, the vehicle is derived from a Pontiac Solstice but has been transformed into a pure single-seat race car with its passenger compartment made obsolete by a hard tonneau cover. Despite its competition red paint scheme, it is difficult not to relate the SD-290 to the timeless shape of a D-Type Jaguar. We can also see the influence of BMW's 2004 H2R land speed record breaking concept in the SD-290's asymmetrical layout, with its racing cockpit protected only by a small windscreen in front of the driver and a faired headrest and roll-bar behind the seat.