Porsche presents the 911 GT2 “Flachbau RS”, an exclusive one-off for a special customer
Porsche's Sonderwunsch personalization program has set a new extraordinary milestone with the creation of a one-off that rewrites the rules of exclusive design: the Porsche 911 GT2 "Flachbau RS". Developed over three years for an extremely demanding customer, this model is a modern and spectacular reinterpretation of the legendary Porsche 935/78 ("Moby Dick") from Le Mans.
A revived tradition: From the 80s to the 2025 patent
The Flachbau body style (also known as the "slantnose") and the Sonderwunsch program have a closely intertwined history in Stuttgart. In the 1980s, the German manufacturer offered a spectacularly modified version of the 911 Turbo (Type 930), directly inspired by the 935 competition model that dominated endurance racing for many years. Between 1982 and 1989, 948 such examples reached customers, and the Flachbau models remain among the rarest variants of the 911 family to this day.
When Porsche registered the names "Flachbau" and "Flachbau RS" with the European Patent Office in May 2025, the automotive world was full of speculation. The mystery has now been solved: the reason was the complex transformation of a 2018 911 GT2 RS (Type 991.2) with Weissach Package.
Purist design and elite aerodynamics
A multidisciplinary team – consisting of specialists from the Sonderwunsch department, Style Porsche, engineers from Weissach, Porsche Motorsport and Manthey – worked for almost three years on this project under the signature of renowned designer Grant Larson (who also conceived the modern interpretation of the 935 presented in 2018).
- "Moby Dick" aesthetic: The exclusive Grand Prix White exterior color was specially developed based on a historic car from the Porsche AG collection. It is combined with matte black sections and exposed carbon fiber, with the U-shaped front element taking on a famous feature of the 1978 competition model.
- Innovative headlights: Instead of the classic round optical blocks, the model uses a lighting system consisting of three ultra-thin LED units, arranged in tiers.
- Extreme aerodynamics: The low-slung front wings feature air outlet slots to reduce downforce, and are complemented by a redesigned front splitter and aerodynamic discs on the rear wheels. The new rear wing, inspired by the 911 GT3 R racing car, is mounted around 5 centimetres higher and can be locked in three positions. At 340 km/h, in the High Downforce setting, the car generates 554 kilograms of downforce on the rear axle.
Despite the complexity of the bodywork modifications, the engineers have managed to achieve a remarkable weight loss: the new Flachbau RS weighs 31.6 kilograms less than a standard GT2 RS Weissach.
Competition interior and obsessive attention to detail
The cabin combines sporty elegance in the front area with a radical weight-reduction philosophy in the rear:
- The PCM infotainment system, audio components and much of the insulation materials have been removed.
- Exposed metal elements in Grand Prix White, carbon trim and partially exposed wiring underline the pure racing car DNA.
- The carbon fiber bucket seats are embroidered with the name "Flachbau RS", along with a stylized silhouette of the famous Nürburgring Nordschleife circuit.
- A gold plaque inscribed with the message "Factory One-Off 2026 | Flachbau RS" certifies the unique status of the specimen.
Rigorous testing on the Nordschleife
Before being given the green light for production, the design was digitally validated through impact simulations and CFD aerodynamic calculations. Porsche built three test vehicles for validation in the wind tunnel and on the road.
Through 50 fiery laps on the Nürburgring-Nordschleife and endurance tests in Weissach, the car simulated the equivalent of 150,000 kilometers of intensive use. Porsche test driver Lars Kern, who drove the one-off on the “Green Hell”, confirmed that the car remains extremely stable and precise even at very high speeds, validating the success of the radical aerodynamic concept.
How much does a unique dream cost? Price estimate for the Porsche 911 GT2 "Flachbau RS"
Although Stuttgart has remained silent on the exact figure on the final invoice for this project, the world of elite collectors and car analysts can draw up a financial estimate based on the unprecedented complexity of the Sonderwunsch program. Such a level of exclusivity does not relate to the usual price scales, but falls directly into the category of listed works of art.
1. Starting point: Value of the donor car
The basis of this project was a flawless Porsche 911 GT2 RS (Type 991.2) with Weissach Package, manufactured in 2018. Since its launch, a production GT2 RS cost almost $300,000, but on the collector's market, values ??have increased spectacularly over time, with used or specially-specified examples frequently trading for between $700,000 and over $1.2 million.
2. The huge engineering and one-off homologation costs
What exponentially increases the value of this unique car is not the car itself, but the colossal research and development (R&D) effort made over three years by an army of specialists from Sonderwunsch, Style Porsche, Weissach, Porsche Motorsport and Manthey.
- Dedicated tools and molds: Unlike a production car, creating the “Flachbau” body panels, low wings and new LED headlight units required individual molds and exclusive manufacturing processes.
- Extreme simulations and tests: The creation of three prototype vehicles for wind tunnel tests, digital impact simulations and driving the equivalent of 150,000 kilometers (including 50 maximum speed laps on the Nürburgring with driver Lars Kern) represents factory-level development costs, borne entirely by a single customer.
3. Absolute exclusivity and “Factory One-Off” status
In the world of bespoke cars, a project of this magnitude, signed by an iconic designer like Grant Larson and officially certified as a “Factory One-Off 2026”, carries a unique premium that is difficult to quantify. The fact that the model even required the registration of new official patents (such as the one for the “Flachbau RS” name registered in 2025) underlines the car’s museum value.
Financial conclusion
Taking into account the purchase of the basic platform, the cost of high-precision workmanship, hundreds of hours of aerodynamic engineering and its status as an absolute one-of-a-kind worldwide, experts estimate that the total value of this Porsche 911 GT2 “Flachbau RS” places the car in the region of 2 to 3 million euros. For the visionary collector who turned the sketches into reality after three years of waiting, the investment represents not just a car, but a new chapter carved into the legend of motorsport.
