XX-rated! Join Top Gear on a tour of Ferrari's secret stash of astonishing XX cars

Way back in 2005, we saw the very first fruit from Ferrari's 'XX' programme. That first car, the FXX, was an Enzo like no other. It was modified by Ferrari to be run exclusively on track. You see, Ferrari had the idea to take on board a ‘special group’ of customers in developing future Ferrari road cars. The idea was they’d drive these hyper-realised machines on Ferrari’s terms, and feed important data back to the engineers to inform thinking around what the company could do for its future customer cars, rather than only taking data from its honed, chiselled in-house test drivers.

But you can't just be anybody and play in the XX club. You have to be a somebody. The best of Ferrari's exclusive customer base. Which means many people will never get close to the likes of the FXX, 599XX, SF90 XX, the XX 'Evoluzione' cars or the FXXK. Fortunately, Top Gear is on hand to show you the rarest of the rare. The holiest of the holy. Welcome to Ferrari's XX secret stash at Fiorano.

Now, tell us your favourite in the comments...