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Not too long ago, the words Porsche and Hybrid would never have seemed to belong together. Now, Porsche's about to put its second on the market, the Panamera Hybrid four-door, and it's announced it will produce this car, the 918 Spyder.

The concept version of this plug-in hybrid concept sports car combined a 500-horsepower V8 engine with electric motors in the front and rear axles that could deliver an additional 218 horsepower. The production version is expected to cost over $600,000.

NEXT: Bentley
Last updated March 15 2011: 6:51 AM ET
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