
Insane 920HP Porsche-Based Hypercar Breaks Cover At Supercar Fest 2025
It's not every day a new hypercar appears, so when RML Group arrived at Supercar Fest with its P39 prototype, the crowd was in for a treat. You might have already spotted the P39's silhouette looks rather familiar. Created as a commemorative piece to celebrate RML Group's 40th anniversary, the hypercar is based on a Porsche 992.1 Turbo S platform. The idea is to combine the 992's daily driver characteristics with a brutal track beast alter ego.
Michael Mallock, Board Member responsible for RML's Bespoke Division, said: 'From the outset we set ourselves the challenge of building a car which could switch personalities at the touch of a button – serene on the road, savage on the circuit. The numbers speak for themselves, but what excites me most is how intuitive and confidence‑inspiring the P39 feels, whatever the setting.'
In collaboration with Litchfield Motors the twin-turbo flat-six has been re-engineered with a larger diameter intake and exhaust plumbing. Thermal routing has also been optimized to enable an uprated 920 hp and 705 lb-ft of torque in Sport/Sport+ mode. To try and help drivers not to immediately crash into a wall when they get behind the wheel, RML Group has added two other driving modes. Wet mode drops maximum power to 600 hp while normal mode limits it to 750 hp for road driving conditions.
Paul Dickinson, Chief Executive Officer of RML Group, added: 'P39 is a rolling demonstration of what RML's engineering division can achieve. By integrating active aerodynamics, a re‑imagined chassis and a 920 hp powertrain, we have created a hypercar that delivers relentless track performance yet remains perfectly at home on the King's Road. It is the purest expression of 40 years of engineering excellence, distilled into a car that wears our badge with pride.'
Although the P39 still bears resemblance to the 992, the bodywork has been redone in carbon fiber to cut weight. Of course, the main feature is the huge rear wing that detracts from the Porsche relation at the rear end. It features electronically movable parts to optimize downforce depending on the scenario. In track mode it moves to increase downforce by an impressive 24%. For maximum performance on straights, the driver can select the drag reduction system to flatten the wing and cut drag by 23%.
Aero kit can be found all over, including at the very front in the form of an extending splitter which slides 75mm forward in track mode. This extra distance repositions nose pressure and keeps the front end sharper into turns. Additional aero features include air curtains around the front wheels, fender cut outs, underbody diffuser and vented rear arches. All of this combines to boost the stock Turbo S's downforce of 1,432N up to 5,100N in road mode and over 6,500N in track mode at 150mph.
To cope with the extra power and unimaginable forces acting on the vehicle, some chassis tweaks were needed to get the best out of it. The track was widened with new suspension links, customised top mounts keep the right camber angles and secondary springs help to find the balance between track and road performance. The P39 also features bespoke R53 supplied dampers turned by RML Group and a hydraulic lift system to offer two rear and three front ride height options.
RML Group plans to show off the P39 hypercar prototype at the Supercar Driver Secret Meet at Silverstone, June 17. Summer appearances will be rounded off at the Silverstone Festival August 22 to 24. As the name suggests, this beauty is limited to a run of just 39 examples.
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