One of just three Ferrari 308 GT/M competition prototypes built is being offered for sale at RM Sotheby’s Monaco sale, which takes place on Saturday, April 25, 2026.
Developed in collaboration with Michelotto, the 308 GT/M was conceived as a Group B contender based on the Ferrari 308 GTB. Unlike earlier competition variants of the 308, which had been adapted from production models and saw success in Group 4 stage rallying, the GT/M was engineered as a purpose-built prototype.
The Ferrari 308 GTB formed the basis for Ferrari’s early competition efforts, with race and rally variants entered between 1978 and 1983 under Group 4 and later Group B regulations. These cars achieved success in events including the Targa Florio and Tour de France. Building on this foundation, Ferrari worked with Michelotto, its customer-racing partner, to develop a more specialised competition prototype.
The resulting 308 GT/M was extensively re-engineered. Its 3.0-litre naturally aspirated V8, featuring Bosch fuel injection and four valves per cylinder, was repositioned longitudinally within a tubular chassis and uprated from around 310-370bhp. A five-speed Hewland gearbox was installed in an inverted configuration to accommodate a Formula 1-derived Borg & Beck clutch.
Suspension was configured with rose-jointed double wishbones and Bilstein dampers, while braking was handled by ventilated Brembo discs with four-piston calipers. A hydraulic handbrake was also fitted for rally use.
The mechanical package was enclosed in lightweight carbonfibre and Kevlar bodywork produced by Auto Sport of Bastiglia, resulting in a total weight of approximately 840kg. This is believed to be the first use of composite bodywork on a Ferrari race car outside Formula 1.
Michelotto produced three examples of the 308 GT/M; chassis 001, the car up for grabs, underwent extensive development testing at Fiorano, including experimentation with different wheelbase configurations. However, plans for a full factory Group B programme were not pursued, because the rear-wheel-drive layout was at a disadvantage against emerging four-wheel-drive competitors such as the Audi Quattro and Peugeot 205 Turbo 16.
During development, Belgian driver Jean Blaton acquired chassis 001 in 1984 through Ferrari concessionaire Garage Francorchamps. Entered by Écurie Francorchamps, the car was campaigned in club-level competition throughout the mid- to late 1980s, including appearances at Circuit Goodyear in Luxembourg and race wins at Zandvoort and Zolder. Of the remaining cars, chassis 002 was entered in the 1984 Rally Autodromo di Monza, where it demonstrated competitive pace before retiring following an accident. The third example was completed at the end of 1986.
Chassis 001 changed hands in January 1996, when it was sold to Guy Domet, before passing to a United States-based owner in December 2006 with the intention of competing in the Ferrari Maserati Historic Challenge series. Under this ownership the car saw regular track use, including appearances at the 2006 and 2007 Cavallino Classic meetings at Moroso Motorsports Park in Florida, alongside outings at Road America in Wisconsin, Lime Rock Park in Connecticut, Sonoma Raceway in California and Virginia International Raceway.
During this period, preparation and maintenance were carried out by Ferrari specialist Motion Products in Wisconsin. Work included repeated rebuilding and servicing of key components such as the engine, driveshafts, cooling system, clutch and transmission. Supporting documentation shows that expenditure on maintenance and trackside support between 2006 and April 2009 amounted to nearly $390k.
The 308 GT/M is estimated at €1.5m to €2m when it goes under the hammer at RM Sotheby’s Monaco 2026 sale. More details can be found here.
