On the power of the 911
“The position of its flat-six engine at the rear of the chassis is an iconic element of the Porsche 911. For many drivers, it’s the single characterisitic that defines the 911 dirving experience. That experience is now further evolved in the new 911, thanks to two new engines that use direct fuel injection.
How does this improve upon conventional fuel injection? By preparing the fuel/air mixture entirely in the combustion chamber, where it is then metered and injected directly with millisecond precision.
From a technical perspective, the more accurate fuel/air mixture and optimization of combustion has increased performance while being more fuel efficient. Power and torque outputs are now 345 and 385 horsepower and 288 lb.-ft. and 310 lb.-ft. for the 3.6- and 3.8-litre engines respectively.”
Source: 2009 Porsche 911 Product Guide, page 10.