Porsche is putting the finishing touches on the 911 GT3 RS as our spies have caught a handful of prototypes undergoing testing in Northern Europe.

Porsche is putting the finishing touches on the 911 GT3 RS as our spies have caught a handful of prototypes undergoing testing in Northern Europe.

Based on the 911 GT3, the RS variant has a familiar design but is distinguished by a muscular hood, ventilated front fenders and a double bubble roof. The car also has a new rear bumper, a revised engine cover and a sporty rear wing. Last but not least, we can see lightweight wheels and rear fenders from the 911 Turbo.

Porsche has been coy on specifications but the model is expected to use a 3.8-liter six-cylinder engine that develops at least 515 PS (378 kW). It will likely be connected to a specially-tuned PDK transmission which will enable the model to accelerate from 0-100 km/h in less than 3.5 seconds.

The 911 GT3 RS is expected to debut at the 2015 Geneva Motor Show, so we should learn more in the coming months.

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