690 HP. 1 Car. 3 Years. Flachbau RS.
Porsche's Sonderwunsch department revealed a one-off road-legal 911 called the Flachbau RS at Monterey on 14 August 2026. It turns a 2018 991.2 GT2 RS Weissach into a modern slantnose homage to the 935/78 Moby Dick.
The 3.8-litre twin-turbo flat-six stays untouched at 690 hp and 750 Nm through a seven-speed PDK, rear-wheel drive only. Deleting the PCM, audio, carpets and sound deadening cut another 31.6 kg from a car that was already the lightest GT2 RS spec. The manually adjustable three-position rear wing sits about 50 mm higher than standard and makes 554 kg of rear-axle downforce at 340 km/h in its High Downforce setting. Three years of work by Sonderwunsch, Style Porsche, Weissach, Porsche Motorsport and Manthey included three test cars, crash and airbag validation, wind-tunnel runs and 50 laps of the Nordschleife.
Porsche is turning Sonderwunsch into a margin business while volume sales are soft, and a single commission now gets full factory crash and Nürburgring validation. That is a very different proposition from an aftermarket widebody, and a quiet test of appetite for a series version.



















