New 991 GT3 and Turbo busy at the 'ring

Our man at the Nordschleife spies Porsche working hard to ready the next round of 911 fun

After a largely successful launch of the new 991-shape Carrera and Carrera S, Porsche's engineers are busy buttoning down the set-up of the new Turbo and GT3 models.

Both of these more aggressive 991s are testing this week on the Nurburgring Nordschleife. And both cars are expected to build on the S model's 400bhp significantly.

If you listen closely to the GT3 mule in the first clip (identified by its larger, disguised, rear arches) you will hear the unmistakable sound of PDK in operation as it changes up a gear almost instantly right in front of the camera. Rumours are starting to firm up here in the village of Nurburg that the next GT3's 4.0-litre motor will come attached only to a PDK gearbox.

The Turbo also benefits from PDK, as well as a LOT of power and torque. The much-quoted figure of 550hp as a minimum level (and 600hp by some) doesn't seem that far-fetched if you listen to the overtake below.