It's not unusual for spy photographers to catch two prototypes testing together, but one lucky San Francisco resident awoke to find four new Porsches on his street.

It's not unusual for spy photographers to catch two prototypes testing together, but one lucky San Francisco resident awoke to discover four new Porsches on his street.

As we have previously reported, the 911 Cabrio will offer a 3.4-liter flat-six with 350 PS (257 kW / 345 hp) as well as a 3.8-liter flat-six that develops 400 PS (294 kW / 394 hp). On the other hand, the 911 Turbo will have an aggressive body kit and a turbocharged engine with approximately 550 PS (405 kW / 542 hp).

Lastly, the Boxster and Cayman will feature an evolutionary design which borrows a few cues from the 911. Engine options remain a mystery, but reports have indicated there could be a four-cylinder and a 3.4-liter flat six with 315 hp (235 kW / 319 PS) and 360 Nm (266 lb-ft) of torque.

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