Porsche has ramped up the already heady performance of the 911 GT3 RS through the adoption of a new, naturally aspirated 4.0-liter version of the company's horizontally opposed flat six-cylinder engine.
The unit kicks out 50 hp more than the 3.8-liter six-cylinder used in the existing 911 GT3 RS. Porsche says the engine has 500 hp at 8,250 rpm, a figure which makes the speedster the most powerful naturally aspirated road-going version of the 911 ever.
Along with the increase in peak power, the engine develops an additional 22 pounds feet of torque, which increases to 339 pounds feet at 5,750 rpm.
The 4.0-liter also is used in the competition variant of the car, the 911 GT3 RSR.
Porsche claims a 0-to-62-mph sprint in 3.9 seconds, one tenth of a second inside the time quoted for the old model. It also quotes a zero-to-124-mph time of less than 12 seconds.
Underlining its competition background, the limited-edition 911 GT3 RS 4.0 will be sold exclusively in white.