As part of Ferrari's XX Programmes, the Ferrari 599XX is a track-only variant of the Ferrari 599 GTB Fiorano, and being meant for track usage makes it not street legal. In 2010, Ferrari introduced the Ferrari 599 GTO, a road-going rendition of the 599XX, and in 2011, an evolution package was made available for the 599XX.
It’s incredibly fast, unimaginably expensive, and you can’t put one in your garage—literally. That’s because, like all “XX” cars, Scuderia Ferrari holds onto the car for owners, maintaining and storing them, so all that owners have to do is show up at the track, strap in (very tightly, for their sake), and let the 599XX loose. While based on the 599 GTB Fiorano, there have been so many changes to bring it to XX specification that it’s impossible to list them all. For example, except the roof, every other body panel has been altered to help with aerodynamics or allow more cooling air to the brakes or engine. Speaking of the engine, meticulously precise construction and an exhaust system that doesn’t have to consider road-going requirements allow the 6-liter V12 to produce 108 more horsepower than its GTB stablemate, allowing the 599XX to accelerate to 100 mph in less than 6 seconds. For the steep entry price and ownership limitations, one thing you don’t get is taillights—those were deleted in favor of exhaust outlets for the active fans that suck air out from under the car below 155 mph. Over that speed, the additional downforce isn’t needed.
The rev limiter has been raised to 9,000 rpm, with the 6.0L V12 engine's power output at 720 hp (537 kW), although the in-game renditions of the 599XX have an incorrect power rating of 691 hp (515 kW), which is 29 hp (22 kW) lower than its factory claimed 720 hp (537 kW).. The 599XX's weight reduction measures include lighter engine unit components, carbon fiber body parts, carbon fibre brake pads, and carbon fibre brake rotors.
The Ferrari 599XX is considerably faster than its road-going counterparts, due to being lighter overall, which allows for better handling and overall performance. Although the 599XX's lightweight construction and downforce both allow it to tackle difficult corners with ease and brake quickly, so as to avoid taking a corner incorrectly, it only has a top speed of 206 mph (332 km/h), which is also attributed to its gearing. The 599XX is best suited for tracks that do not have a lot of long straights.