Porsche has been actively testing the updated Cayenne family since February last year and about a year and a half later, camouflaged Cayenne prototypes are still being pushed to their limits. We have a new batch of spy photos showing a Cayenne Coupe prototype lapping the Nurburgring and our photographers told us it’s from the GTS trim level.

We don’t have a video of this test run on the German track but even from the photos, the Cayenne Coupe GTS facelift looks quite fast and composed. The rear wing is deployed, which means the trial vehicle is probably travelling at a high speed during the photo session. There’s a driver and a co-driver onboard, both wearing safety helmets, hinting they are trying to extract all the performance from the machine down to the last drop.

Gallery: Porsche Cayenne Coupe GTS facelift spy photos

Porsche keeps using black tape on black prototypes as a strategic move to keep the design hidden from the spy photographers. Under a closer inspection, however, you’ll see the overall shape of the rear lights – the highlight of the visual revisions – won't be changing much, with narrow corner lenses connected horizontally with a strip spanning from coast to coast. This layout is very similar or even quite possibly identical to the lights we’ve seen on other refreshed Cayenne prototypes.

Changes are expected inside the cabin as well, where the dashboard is expected to be refreshed with a design inspired by the current 911. Unfortunately, we haven’t had the chance to take a closer look at the interior of the refreshed Cayenne, though our spies were able to catch a glimpse of the cabin recently.

Under the bonnet, the Cayenne Coupe GTS has a detuned version of the twin-turbocharged 4.0-litre V8 found in the Cayenne Turbo. In GTS trim, the eight-cylinder mill generates 453 bhp and 457 pound-feet of torque, making it just slightly more powerful than the Cayenne S. There are rumours about a potential power increase with the facelift and we won’t be surprised if the output figures go up by a few percent. Nothing can be confirmed at this point, though.