Porsche is indeed busy giving their 911 GT cars some much needed upgrades and redesigns. Aside from the 911 GT2 RS, Porsche is also working on the 911 GT3 RS facelift.

First unveiled during the 2015 Geneva International Motor Show, it's 10kg lighter than the standard GT3, has additional aerodynamic upgrades and is powered by a new 4.0-liter naturally-aspirated flat-six engine.

Spied: Porsche 911 GT3 RS facelift seen for the first time

Based on the photos taken by our spies, the front fascia of the 911 GT3 RS facelift gets a new front bumper derived from the standard 911 GT3 facelift. Apart from that, it looks like the hood will now have air ducts. These will either help the cooling system or deliver more downforce towards the rear.

Around the back, it has a different rear wing compared to the standard GT3 and has a slightly different looking rear bumper to boot. The taillights appear to have been borrowed from the standard model as well.

Rear quarter of the Porsche 911 GT3 RS facelift prototype

As far as the powertrain is concerned, the refreshed 911 GT3 RS could produce up to 540 PS. Currently, the updated GT3 now generates 500 PS, the same output rating as the current GT3 RS. Transmission options that could make its way in the 911 GT3 RS include a manual gearbox and a PDK dual-clutch transmission.

A closer look at the rear of the 911 GT3 RS facelift

The upcoming 911 GT3 RS facelift is expected to make its world debut at the 2017 Frankfurt Auto Show.