The 959 has to count as one of the most technologically advanced Porsches ever until the 918 Spyder came along. These days there's nothing quite like it in the range. The Porsche 911 Turbo S comes closest for sheer power, but the 959 was unhinged and deranged in a way modern Porsches simply aren't.

Porsche built it to rally in the infamous Group B category, which the FIA canceled before the 959 was even finished. Thanks to the motorsport connection, the 959 features several features that were way ahead of their time in 1986. Variable torque bias for the four-wheel-drive system, tire pressure monitoring, sequential turbos, and an adjustable ride height were just some of the highlights.

But some 959s were more special than others, and one such special car is now up for sale with some very unique bragging rights.

Only 300 were built, not including the 37 prototypes. The car you see here is not just one of those 300, but part of an even smaller club within the prototypes.

One of the final specifications of the 959 was named "Sport," and Porsche built three Sport prototypes before settling on the production iteration. Only 29 Sports were ever made.

This car was internally known as F9, and it somehow escaped the Porsche factory before it could be put in the famous Porsche Museum. Just 12 of the 959 prototypes received the "F" designation, and only a handful are in the hands of private collectors. F9 is the only Sport prototype believed to be in private hands.

F9 is special because it's still a lightweight car like the Sport, but it has a unique set of features. The production Sport dropped the standard car's Komfort seats and leather interior. F9 still has the Komfort seats and several buttons that don't work. It has an air conditioning button, but the car doesn't have it.

The same goes for the rotary dials for the damping and ride height. Porsche settled on a static suspension setup for the Sport, which means F9's dials do absolutely nothing. It also doesn't have headlight washers, and you can see the rear wing is a bit wonky.

Because of the above omissions, F9 weighs 220 pounds less than the production car. Though it was never confirmed, F9 is believed to be the quickest and fastest 959 of all. For reference, the fastest models were capable of 211 mph top speeds.

So, how did F9 escape Porsche's hands? Vasek Polak did a lot of Porsche motorsport in the US, and as a thank you, he was gifted F7 and F9. Polak loaned his cars to the Matsuda Collection in Japan, where they remained until Polak passed away in 1997.

It was then purchased by an Italian rally driver called Mauro Bompani, who had it restored by Rennsport Porsche in Italy. In 2020, it was sold to an Austrian collector, Georg Konradsheim. Konradsheim knew how special the car was and commissioned the production of a hardback book dedicated to F9, which is included in the sale.

F9 has just 3,679 miles on the clock, which is extremely low considering Porsche's engineers put these cars through absolute hell during the development phase to hone the performance of the 444-horsepower 2.8-liter twin-turbo flat-six.

So the question is, how much? It's up for sale via Girardo & Co and is located in England. The price is merely listed as "price upon application." That's rich people speak for if you have to ask, you can't afford it, poor person.