This is the forthcoming 2013 Porsche 911 GT3 R race car, spotted during an evening shakedown test.
While based on the current 991 platform, the pictures show the racer running on a much wider track, with suitably enlarged front and rear wings. The nose has also been completely redesigned from the road car.
The aero package fitted to the car is substantial, with a large rear spoiler, intricate rear diffuser and an air intake built into the front bonnet.
The emergence of the race car is a good indication that a GT3 version of the 911 road car will also be launched next year.
As the name suggests, the car will compete in FIA GT3 class competition. The first customer cars are expected for delivery early in 2013.