The supercar world is dominated by limited-production hypercars and exclusive special editions. However, for those seeking something even rarer, there exist one-offs—cars built as singular masterpieces.
These unique creations come to life for a variety of reasons: some serve as a demonstration of an automaker’s cutting-edge technology, others are bespoke commissions for ultra-wealthy clients, and occasionally, they emerge as serendipitous innovations. Regardless of their origin, these vehicles stand alone as some of the most desirable automobiles ever made.
Over time, this elite category of cars has grown to include numerous contenders. While all of them are remarkable, a select few manage to stand even further above the rest, thanks to an extraordinary fusion of design and performance.
These one-offs leave a lasting impression—perhaps even touching the soul—if one is fortunate enough to witness them in person. Here, we’ve gathered a list of 10 of the greatest one-off supercars that deserve recognition.
The following lineup showcases these exceptional cars in chronological order, from the earliest to the most recent. Each was chosen for its distinctive design, groundbreaking engineering, and overall uniqueness.
To qualify for this list, the vehicles had to meet two key criteria: they must have been sold to a private owner at some point, and they must be road-legal.
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1. Maserati Boomerang (1971)
Engine: 4.7-liter V8
Power: 310 hp
Transmission: 5-speed manual
0-60 mph: 6.2 seconds
Top Speed: 186 mph (claimed)
The Maserati Boomerang was a bold vision of the future. Designed by Giorgetto Giugiaro and Italdesign, it was built upon the Maserati Bora platform and introduced a radical wedge-shaped aesthetic, paired with a striking glass greenhouse that exemplified geometric minimalism.
Inside, its cabin was ahead of its time, featuring a driver-focused cockpit and an astonishing floating steering wheel that housed all essential instruments.
Despite its futuristic looks, the Boomerang was a fully operational vehicle. Powered by a 4.7-liter V8 delivering 310 horsepower, it was reportedly capable of reaching 186 mph—though it’s unclear whether it was ever pushed to such speeds.
An iconic piece of Maserati’s history, it exchanged hands several times before ultimately being auctioned in 2015 for €3,335,000 ($3,489,910).
2. Aston Martin Bulldog (1979)
Engine: 5.3-liter twin-turbo V8
Power: 600 hp
Transmission: 5-speed manual
0-60 mph: 4.9 seconds
Top Speed: 205.4 mph
Conceived as a challenger to break the 200-mph barrier, the Aston Martin Bulldog became an icon of the 1970s. Like the Boomerang, it featured a low-profile, wedge-shaped design, along with gullwing doors and concealed headlights integrated into the center of the hood.
Its twin-turbocharged V8 produced 600 horsepower, making it one of the most powerful supercars of its time. Engineers initially targeted a top speed of 237 mph, though in its original testing, it narrowly missed the 200-mph mark.
However, in 2023—after undergoing a full restoration—the Bulldog finally achieved what it was built for, reaching a top speed of 205.4 mph. Decades later, its original ambition was finally realized.
3. Isdera Commendatore 112i (1993)
Engine: 6.0-liter Mercedes-Benz V12
Power: 408 hp
Transmission: 6-speed manual
0-60 mph: 4.7 seconds
Top Speed: 211 mph (claimed)
The Isdera Commendatore 112i was the second model developed by Isdera, an ambitious sports car manufacturer founded in the early 1990s.
Unfortunately, despite its potential, the car never saw full production. The company was established by Eberhard Schulz, a former Porsche engineer, and had previous success collaborating with Mercedes-Benz on the Imperator 108i in the late 1980s.
While the Imperator was impressive, the Commendatore was even more so. Equipped with a Mercedes-Benz V12 engine, a six-speed manual transmission, and various Porsche-sourced components, it was envisioned as a Le Mans contender.
However, financial difficulties forced the company into obscurity, leaving this one-off as a lost dream. Over the years, the car changed owners multiple times before heading to auction in 2021, where it sold for €1,113,125 ($1,171,881).
4. Lotec C1000 (1995)
Engine: 5.6-liter twin-turbo Mercedes-Benz V8
Power: 1,000 hp
Transmission: 5-speed manual
0-60 mph: 3.2 seconds
Top Speed: 268 mph (claimed)
The Lotec C1000 stands as a remarkable feat of engineering, built at the request of a businessman from the United Arab Emirates who sought the ultimate road-going hypercar with no budget constraints.
The result was a collaboration between Mercedes-Benz and the German racing specialists at Lotec, producing a vehicle with an ultra-lightweight carbon-fiber and aluminum monocoque chassis. Its futuristic, aggressive design remains unparalleled.
Under the hood, the twin-turbocharged 5.6-liter Mercedes-Benz V8 delivered a staggering 1,000 horsepower—an incredible figure even by today’s standards. The C1000 encapsulates raw power and innovation, making it one of the most extraordinary supercars ever created.
5. Ferrari P4/5 by Pininfarina (2006)
Engine: 6.0-liter V12
Power: 660 hp
Transmission: 6-speed automated manual
0-60 mph: 3.0 seconds
Top Speed: 233 mph (estimated)
What do you do if you own a Ferrari Enzo but aren’t satisfied with its design? If you’re film director and collector James Glickenhaus, you commission Pininfarina to completely redesign it—at a jaw-dropping cost.
Glickenhaus envisioned a modern interpretation of Ferrari’s legendary endurance racers from the 1960s, and for a reported $4 million, Pininfarina brought that vision to life.
The result was a one-of-a-kind supercar with a stunning hand-built carbon-fiber body that paid homage to Ferrari’s racing heritage.
Mechanically, the car retained the Enzo’s 660-horsepower naturally aspirated V12, capable of reaching 225 mph. While a track-only variant was later developed in 2011, this remains the only road-legal version, securing its place on this list.
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6. GM EcoJet (2006)
Engine: Honeywell LTS101 turbine engine
Power: 650 hp
Transmission: 4-speed automatic
0-60 mph: 3.5 seconds
Top Speed: 165 mph (estimated)
Some individuals have both the influence and resources to turn their automotive dreams into reality, and Jay Leno is one of them.
Thanks to his extensive car collection and deep connections in the automotive world, he collaborated with General Motors in 2006 to create one of the most unique one-offs ever built by an American automaker.
Named the EcoJet, this supercar featured a gas turbine engine capable of running on biodiesel, combined with a striking design that blended Cadillac’s early 2000s Art and Science styling with Buick-inspired rear elements from the 1960s.
Unlike many concept cars, the EcoJet was fully functional, with a modern interior built for driving. However, the engine’s sheer loudness restricts where it can be used—and, oddly enough, it may even be missing a window.
7. Rolls-Royce Sweptail (2017)
Engine: 6.75-liter V12
Power: 453 hp
Transmission: 8-speed automatic
0-60 mph: 5.6 seconds
Top Speed: 150 mph (estimated)
The Rolls-Royce Sweptail is the ultimate expression of bespoke luxury, commissioned by an affluent client who sought a vehicle inspired by classic Rolls-Royce models and luxury yachts. The result is an automotive masterpiece, reportedly taking four years to complete and featuring a design unlike any other modern Rolls-Royce.
Built on the Phantom VII platform, the Sweptail boasts an elongated, flowing silhouette, a dramatic sweeping rear, and an expansive panoramic glass roof.
Every aspect of its handcrafted interior, from the opulent wood and leather to the concealed champagne chiller, was tailored to the owner’s exact specifications.
The project came with an eye-watering price tag of $13 million, briefly making it the most expensive new car in the world. Whether the cost was justified is up for debate, but there’s no denying that the Sweptail is one of the most extravagant custom cars ever made.
8. Kode 0 (2017)
Engine: 6.5-liter V12
Power: 700 hp
Transmission: 7-speed automatic
0-60 mph: 2.9 seconds
Top Speed: 217 mph (estimated)
Some one-offs capture a fleeting moment of brilliance, and the Kode 0 is a perfect example. Designed by Ken Okuyama—the visionary behind the Ferrari Enzo—this supercar is a modern tribute to the wedge-shaped legends of the 1970s, infused with futuristic design elements.
While its angular lines may evoke thoughts of the Lamborghini Huracán or Gallardo, the Kode 0 is actually built on the Aventador’s platform.
The bodywork pays homage to icons like the Lancia Stratos Zero and Lamborghini Countach, while retaining the Aventador’s mechanicals, including its 700-horsepower naturally aspirated V12.
Though the performance remains unchanged, it’s still an astonishing machine. However, given its exclusivity and value, we suspect this masterpiece will spend more time on display than on the road.
9. Bugatti La Voiture Noire (2019)
Engine: 8.0-liter quad-turbo W16
Power: 1,479 hp
Transmission: 7-speed dual-clutch
0-60 mph: 2.5 seconds
Top Speed: 261 mph (limited)
Once holding the title of the world’s most expensive new car, the Bugatti La Voiture Noire is a tribute to the lost Bugatti Type 57 SC Atlantic, a legendary pre-war creation once owned by Jean Bugatti himself.
Revealed in 2019, this one-off masterpiece was crafted for an ultra-exclusive client (rumored to be Cristiano Ronaldo), though its actual owner remains a mystery.
Underneath its meticulously sculpted carbon-fiber bodywork lies the same powerhouse as the Bugatti Chiron: a 1,479-horsepower quad-turbo W16 engine.
While its performance figures mirror those of the standard Chiron, La Voiture Noire stands apart with its breathtaking design—both elegant and aggressive. Rarely do ultra-wealthy collectors display exceptional taste, but in this case, the result is undeniably spectacular.
10. Lamborghini SC20 (2020)
Engine: 6.5-liter V12
Power: 770 hp
Transmission: 7-speed automatic
0-60 mph: 2.9 seconds
Top Speed: 217 mph (estimated)
The final and most recent entry on this list is a roofless marvel that represents the pinnacle of Aventador-based design.
A true one-off, the SC20 incorporates elements from the Essenza SCV12, Diablo VT Roadster, and classic speedsters, blending them into an extreme, open-top supercar.
Built on the Aventador SVJ platform, the SC20 boasts a fully carbon-fiber body sculpted for maximum aerodynamic efficiency and cooling.
At its heart lies a 6.5-liter naturally aspirated V12, pushing 770 horsepower and reaching a top speed of 217 mph.
However, without a windshield, experiencing that speed firsthand would be nothing short of exhilarating. This is easily one of the most radical Lamborghinis ever created, making the retirement of the Aventador all the more bittersweet.