Only 500 units of the GT2 RS will be produced. The car will be Porsche's most powerful road car ever, featuring a power to weight ratio of 4.9 lbs (2.21 kg) per horsepower.

Official details and photos have been released on the upcoming Porsche GT2 RS.

Well, we were right about the power wattage - it will indeed be 620 PS (462 kW) - and wrong about the number of units that Porsche will produce - 500 will be made not 300. Weight loss versus the 911 GT2 will be a substantial 70 kg (as opposed to the previously reported 90 kg).

That power rating will make this the most potent Porsche road car in history. And its quite a technical achievement to squeeze all those kilowatts from a 3.6 liter boxer engine, much of it attributable to the two variable turbine geometry turbochargers.

The details:

The car will weigh a mere 3,020 lb (1,370 kilograms), giving it a power to weight ratio of 4.9 lbs (2.21 kg) per horsepower, and rides on 245/35 ZR 19 tires at the front and 325/30 ZR 19 for the rear axle. It will come with anti-roll bars and Porsche Adaptive Suspension Management (PASM).

It's time on the Nürburgring's Nordschleife track: 7 minutes and 18 seconds. 0 to 100 km/h in 3.5 seconds (0-60 mph in 3.4 seconds), 0 to 200 km/h in just 9.8 seconds, and 0 to 300 km/h in 28.9 seconds. Top speed: 205 mph or 330 km/h.

To shed weight, Porsche makes use of carbon-fiber-reinforced (CFR) components, such as the CFR plastic for the bucket seats.

"GT2 RS" tags are placed on the doors and rear lid to distinguish the car too.

The car will be available in Europe from September 2010, in the USA from October 2010. The Euro base price is €199,500. Including VAT and national specifications/equipment the new 911 GT2 RS will retail in Germany at a price of €237,578.  For the U.S. market pricing starts at $245,000 (€193,000).

The new GT2 RS is set for its first public unveiling on August 25 at the Moscow auto show.

See the press release for full details.

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