It's hard to believe that the ambitious Aston Martin RM01 hypercar designed in collaboration with Red Bull is actually a hardcore road car given it weighs less than 1000 kg and is capable of reaching speeds over 250 mph. It's an all-too common example of a super lightweight street car aimed at track-day enthusiasts that you can drive home on the road after you've thrashed it around the racetrack. This Porsche 911 currently on sale at Mark Donaldson, on the other hand, originated as a racecar before being converted to a road car.

In other words, this is a a true racecar for the road. Between 1995 and 1997, GT1 regulations meant that manufacturers had to build 25 road-legal cars to enter the sports car racing series, representing the last breed of road-going supercars with genuine racing pedigree.

Complying with this, Porsche built 25 examples of its 993-generation 911 GT1s for the road, with a 3.2-liter boxer engine delivering 600 horsepower through its 6-speed synchromesh gearbox. While Porsche struggled to compete with the McLaren GT1, this example has a lot of racing history. The ravishing racecar debuted in the 1997 FIA Championship at Hockenheim where it finished eighth overall.

Shortly after, it competed in the grueling Le Mans 24 Hours race and was the highest placing consumer-ready GT1, but was forced to retire due to engine troubles.

The following year was far more successful, however: the 993 GT1 competed in the Daytona 24 Hours finishing third overall, as well as the British GT Championship where it secured a race win at Croft and a support race at that year's F1 British Grand Prix driven by Touring Car veterans David Leslie and Matt Neal, finishing third overall. It was subsequently retired in 1999, sadly, when the GT1 class was abolished by the FIA and put into storage until 2005.

Its iconic racing livery was restored representing its best overall win at Daytona and was later acquired by a Swedish collector before being modified for road use last year with new fuel lines, belts, rebuilt turbos and new electronic management.

No price has been listed by Mark Donaldson, but it's not very often you get the chance to own a road-going racecar.