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Porsche just revealed the second-generation Panamera sedan last week and already the automaker’s performance-crazed engineers are at work on hotter models. That’s according to an anonymous insider speaking to Motor Trend, who described the work-in-progress car as a “Porsche 918 with a back seat.” Given that the spanky new Panamera, with its 550 horsepower 4.0-liter twin-turbo […]

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