For nearly two decades, the letters "XX" have delineated something quite apart from the cars in Ferrari's showrooms. Beginning with the FXX of 2005 and continuing through the 599XX, FXX-K, and FXX-K Evo, the XX program granted a small circle of client-drivers access to unhomologated, track-only machines that doubled as testbeds for Maranello's engineers. Ferrari's road-going Special Series pursued extreme, track-oriented performance in parallel, but the two programs never overlapped. That changed in June 2023 with the unveiling of the SF90 XX Stradale, the first XX Ferrari ever homologated for the road.

Derived from the plug-in hybrid SF90 Stradale, the XX pairs a reworked twin-turbocharged 4.0-liter V8 with three electric motors for a combined 1,030 PS, delivered through an eight-speed dual-clutch transmission carrying shift logic from the Daytona SP3. Furthermore the XX Stradale puts power to its rear wheels only rather than through an all-wheel-drive arrangement as with the SF90 Stradale. Its signature is a fixed rear wing, the first on a road-going Ferrari since the F50, which works with a redesigned active Gurney flap to generate up to 530 kilograms of downforce at 250 km/h, double that of the standard SF90. Production was limited to 799 coupes and 599 Spiders.

Chassis number 304599 was ordered through B.I. Collection AG of Urdorf, the official Ferrari dealer for Zürich. Drawing from Ferrari's Extracampionario palette, its bodywork wears Matte Verde Masoni, an understated yet captivating green that shifts between olive and slate depending on the light, set against a contrasting Nero DS 1250 roof. Black racing numerals outlined in Argento Nürburgring adorn both doors and read 51-a number that will resonate with any Ferrari enthusiast as that of the 499P that won the centenary 24 Hours of Le Mans in 2023.

The specification is notably generous with carbon fiber, which extends to the wheels, front spoiler, side air splitters, underdoor covers, rear diffuser, gloss rear spoiler, engine covers, and rear boot trim, while titanium exhaust pipes and Scuderia Ferrari shields on the front fenders complete the exterior. Everyday usability has not been overlooked, with the front lift system, Adaptive Frontlight System, front and rear parking cameras and sensors, and an electrochromic rear-view mirror all fitted. Inside, the Apollo Nero cabin is detailed in Grigio Scuro Alcantara and carbon fiber for the upper center console, with best-weight racing seats, black four-point harnesses, contrast stitching and Cavallino-embroidered headrests, and a colored steering wheel with Alcantara Nero grips. A premium Hi-Fi system, smartphone integration, MyFerrari Connect, and a silver dedication plaque complete the specification.

Following delivery to B.I. Collection on 10 July 2024, the car was registered to its first and only owner in Switzerland on 2 August 2024. It has been used sparingly since. Its first scheduled service was carried out by B.I. Collection on 3 September 2025 at 592 kilometers, including a cabin filter replacement and inspection, and the car returned to the dealer on 6 October 2026 at 776 kilometers, when its engine oil and filter, cabin filter, and brake fluid were renewed. Both visits are stamped in the original German-language warranty booklet which accompanies the car.

Offered from its original owner with approximately 800 kilometers from new, chassis 304599 pairs a richly optioned specification with a rare opportunity to acquire an XX Ferrari without the confines of the circuit.