While the rest of the 992 generation went for the turbocharged engines, the GT3 RS had to stay naturally aspirated in order to get the FIA racing homologation for the GT3 class.
The GT3 RS was designed for the race-track and with genuine motorsport solutions. It offered the aggressive look of a car that told you to stay out of its way. The round headlights offered the unmistakable Porsche 911 view. The big bumper with a low apron and grilles to cool the brakes and engine went low to the ground and an additional lip-spoiler amplified the downforce over the front axle. Due to engineering reasons, the front axle was fitted with 20” light-alloy wheels and 21” for the rear axle. The vents on the upper side of the front fenders relieved the air trapped in the wheel-wells. At the back, the big, adjustable, wing offered the much-needed downforce to help the car runs faster while cornering.

Inside, the race-inspired interior featured carbon-fiber bucket-seats, while the doors featured leather loops instead of door handles. The PCM (Porsche Communication Management) system was enhanced with a log feature that could have been downloaded and reviewed after the race. It showed braking points, race-lines, and accelerations (longitudinal and lateral). A no-cost option was the Clubsport package, which added a roll cage in the back a manual fire extinguisher, preparation for battery disconnect switch, and a six-point harness for track use. On top of that, the Weissach package added lighter magnesium wheels and additional carbon-fiber elements that lightened the car as low as 1430 kg.

The 4.0-liter flat-six engine was carried-over from its predecessor but enhanced with another 20 hp for a total of 520 hp. It was mated to a 7-speed PDK (double-clutch) gearbox.