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These are the best spy shots yet that we've seen of the upcoming 2012 Porsche 911.

This time we're up close to two coupe prototypes seemingly undisguised (although at this stage of the development process prototypes can still be hiding under false body panels). Noteworthy is how the second prototype is showing the retractable sunroof opening of the next-generation model.

We're also getting a far sharper look at the new rear end design, particularly the frame between the taillights.

The next 911 will feature a stop/start system and regenerative braking becoming standard technology on the model, in order to improve fuel-economy and CO2 emissions.

An updated 3.6 liter inline 6-cylinder good for 365 bhp (272 kW / 370 PS) and 400 Nm (295 lb-ft) of torque will be the entry-level power plant. A revised 3.8 liter 6-banger will be fitted to the Carrera S model producing 415 bhp (309 kW / 421 PS) and 440 Nm (325 lb-ft) of torque. Transmissions will be a choice of the seven-speed PDK sequential double-clutch gearbox or the more pedestrian six-speed manual.

Look for the next 911 to make its debut sometime next year.

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