In developing the 991.1 GT3 R special attention was paid to lightweight design, better aerodynamic efficiency, reducing consumption, improved handling, further optimized safety as well as lowering service and spare parts costs.

The 991.1 GT3 R features the distinctive double-bubble roof adopted from the streetcar, and a lengthened wheelbase by 8.3 centimeters, ensuring a more balanced weight distribution and more predictable handling, particularly in fast corners compared to the previous generation GT3 R. By applying systematic lightweight solutions for the body, add-on parts, and suspension, the engineers significantly optimized the position of the center of gravity compared to its predecessor. The lightweight body design of the 911 GT3 RS production car featuring intelligent aluminum-steel composite construction was the ideal basis for the race car. The roof, front cover assemblies, wheel arches, doors, side and rear sections including the rear cover are all made of lightweight carbon-fiber (CFRP). All windows including the windshield are polycarbonate.

Powered by a four-liter flat-six engine with direct injection and variable valve timing. Coupled to a Porsche sequential six-speed constant-mesh transaxle gearbox. Operated via shift paddles positioned on the steering wheel.

Improved aerodynamics, with wheel arch air vents on the front fenders increase downforce at the front axle and the rear wing measuring two meters in width by 40-centimetres in depth. Adopting the RSR concept of a centrally positioned radiator improving the center of gravity and better protection against damage. The venting of hot air through louvers in the hood.

The 991.1 GT3 R received a newly developed PFC brake system. The front axle, six-piston aluminum monobloc racing brake calipers combined with 380 mm diameter ventilated and grooved steel brake rotors. At the rear axle, four-piston calipers combined with 372 mm diameter ventilated and grooved steel brake rotors.

Safety features were another development focus for the 991.1 GT3 R. The FT3 safety fuel cell capacity increased to 120 liters, featuring a fuel cut-off safety valve. The doors and the side windows are removable, and there is a larger safety access roof hatch. A new racing bucket seat provides drivers better protection. The seat can be adjusted fore and aft. The seat has an adjustable padding system with options to suit individual drivers. A four-air jack system is built into the car.