Porsche's new 911 Turbo S will become the fastest and most powerful 911 Turbo model ever when deliveries start in May.

The Turbo S badge has been used twice before, on limited-production, run-out versions of the 993 and 996. This time, however, Porsche says the 997 Turbo S will be a model in its own right, sitting right at the top of the current range for the final two years of the 997's production. It has been created to meet demand from customers asking for the ultimate driver's 911, and many of the options from the standard 911 Turbo are available as part of the list price.

Power from the 911 Turbo's twin-turbocharged, 3.8-liter flat-6 engine has been increased in the Turbo S to 523hp, up from 493hp. Its torque output has also been increased by 37lb-ft, to 516lb-ft. Despite these increases, combined fuel economy remains at 24.8mpg.

Power is transmitted to all four wheels through a 7-speed PDK dual-clutch gearbox in conjunction with Porsche's Traction Management system. Wheel-mounted paddle shifters are included as standard for the first time in a 911. Porsche's Torque Vectoring system, which includes a mechanical limited-slip differential, is also standard.

The chassis is upgraded by the inclusion of the Sport Chrono package, which includes Launch Control and Dynamic Engine Mounts. These changes improve chassis rigidity, reduce vibration and help boost speed and acceleration. The Turbo S's 0-62mph time is 3.3sec, 0.3sec faster than the Turbo's. It can get from 0-124mph in 10.8sec and reach a top speed of 196mph.

Other standard features over the regular Turbo include Ceramic Composite Brakes, Dynamic Cornering Lights, sports seats with increased adjustability, 19in RS Spyder alloys wheels and two-tone leather seats.

The Turbo S Coupe and Cabriolet will be available in May 2010 with an MSRP of $159,100 and $170,200, respectively.

Source: Autocar