porsche sonderwunsch just built a special 911 gt2 flachbau rsPorsche's bespoke Sonderwunsch division has revealed a factory-built, street-homologated creation: the Flachbau RS.Based on the 991.2-generation GT2 RS, this unique commission takes direct visual and aerodynamic cues from the 2018 track-only 935 Clubsport and the historic 935/78 "Moby Dick" racer. Unlike its track-bound ancestors, this one-off has been fully certified for road use across Europe.Porsche 991.2 911 GT2 Flachbau RS: All The DetailsPorsche 991.2 911 GT2 Flachbau RS: All The DetailsView GalleryAdvertisementAdvertisement36 photosThe three-year development project brought together Style Porsche, Porsche Motorsport, Manthey, and retired designer Grant Larson-the man responsible for the 2018 935 track car. To create the iconic slant-nose silhouette, engineers completely reworked the front end. Thin LED running lights replace the traditional round GT2 RS headlamps, set above expanded air intakes and a revised fuel-filler flap mechanism.The exterior wears Grand Prix White paint paired with exposed carbon-fiber accents, NACA hood ducts, and rear carbon aero discs. At the back, an enlarged rear wing-derived from the GT3 R Rennsport and sitting 51 mm higher than standard-pairs with a Manthey rear diffuser. The overall setup produces 1,221 pounds of downforce at the car's 211-mph top speed, exceeding a GT2 RS with the Manthey Kit.porsche sonderwunsch just built a special 911 gt2 flachbau rsDespite being a single factory commission, Porsche subjected the Flachbau RS to full OEM development standards. Testing included digital crash simulations, wind tunnel evaluation, high-speed airfield runs at Mendig, and a 50-lap endurance stint at the Nürburgring with test driver Lars Kern.AdvertisementAdvertisementTo trim 70 pounds from the donor chassis, engineers deleted sound insulation, floor coverings, the audio setup, and the central infotainment display. The rear cabin is stripped down to bare, painted metal. Even legally required road items like towing eyes are housed in a removable lightweight box.porsche sonderwunsch just built a special 911 gt2 flachbau rsUnder the rear decklid, the 3.8-liter twin-turbocharged flat-six remains mechanically stock, delivering 690 horsepower and 553 lb-ft of torque to the rear wheels via a seven-speed dual-clutch transmission featuring a balsa wood shift knob. While Porsche keeps official pricing for Sonderwunsch factory commissions private, replacing a Weissach-equipped GT2 RS and engineering custom road-homologated tooling places the build firmly into seven-figure territory.Become an AutoGuide insider. Get the latest from the automotive world first by subscribing to our newsletter here.