The new Porsche 911 GT3 Cup is powered by a 3.8-litre six-cylinder flat engine. It generates 460 hp (338 kW) at 7,500 revs, surpassing the predecessor by 10 hp. A six-speed dog-type gearbox developed by Porsche Motorsport which is operated via shift paddles at the steering wheel for the first time in a Porsche brand trophy race car transmits the power to the rear axle. The single piece race wheels with centre mount were also new.
As the rules do not permit higher output engines, the engine for the 991 RSR was taken from the 997 GT3 RSR 4.0 and the development work focused on the chassis, body, aerodynamics and the gearbox. A wishbone front suspension replaced the McPherson struts used in 997. A new development was the lightweight gearbox. One of the priorities in the development was the more evenly balanced weight distribution. The centre of gravity was lower, too.
This concept car was kept in secrecy until 2020. Under the cover there is a Volkswagen XL carbon fibre monocoque chassis and the car could have been powered by a high-revving motorbike engine. The 1:1 hard model of the possible future 904 looks similar to the Porsche 918 supercar from the front and to the F. A. Porsche designed 904 Carrera GTS supercar from the side. It looks just perfect!
In 2013, a small team from Weissach developed a tribute to the 1970 Le Mans winner. The concept utilizes adaptive aerodynamics with Salzburg livery like the original. Carbon Fibre skin, carbon fibre Monocoque and a turbocharged eight-cylinder engine with up to 1,000 PS provides the power. The front and rear suspension are based on 918 components, utilizing motorsport-inspired linkages and pushrods.