The Buick GNX Debuted At $30,000, It’s Raking In Supercar Money Today
In 1987, around $30,000 bought you a sinister black Buick coupe that could outrun almost anything on American roads. Buick built just 547 of them, sold them through its dealers, and then moved its lineup away from rear-wheel-drive performance cars. Most buyers drove them. A few parked them in climate-controlled garages and waited. Nearly four decades later, those patient owners are cashing in, and one recent sale proved this one-year Buick now trades in the same price bracket as exotic machinery from Italy and Germany.
What A Buick GNX Is Worth Today
The GNX hit a new peak in September 2026, when car #450, showing just 30 miles, sold for a record $427,000 in an online auction. That same car had changed hands for $200,000 only two years earlier, so its value more than doubled in that time.
Ordinary GNXs don’t fetch that kind of money, but they’re hardly cheap. Recent confirmed sales include $192,500 for a roughly 5,000-mile car in January 2026 and $225,000 for an 8,000-mile example in July. A 5,000-mile car stalled at a $180,000 high bid the same month the record fell, which shows that even driven GNXs now start well into six figures.
Why Low-Mileage GNX Cars Command The Biggest Prices
Mileage is the headline number, but paperwork is what turns a good GNX into a record-setter. Every car wears a numbered plaque on the passenger side of the dash, and collectors expect that number to match a complete paper trail. The record car came with its original window sticker, a clean title, and a full set of factory literature.
The best cars go further. One documented example, car #095, carried copies of its certificate of origin, bill of sale, window sticker, and correspondence with both Buick and ASC Inc., the firm that handled the conversions. An owners’ registry tracks the model too, so any gap in a car’s history raises questions in a market where originality is everything.
What The Buick GNX Cost New In 1987
Buick priced the GNX at just under $30,000 when it went on sale in 1987. For that money, buyers got a numbered version of the Grand National, converted by a specialist firm after leaving Buick’s regular production line.
That was serious money for a Buick in 1987, and it carried a big premium over the regular Grand National. Even adjusted for inflation, though, it still comes in under $100,000 in today’s money. The record sale works out to more than 14 times its original price before any adjustment.
What Made The GNX More Than A Grand National
The 1987 Grand National was already quick, with Buick rating its turbocharged 3.8-liter V6 at 245 horsepower. The GNX officially added just 31 hp for a total of 276 hp, along with 360 lb-ft of torque. Nobody believed that figure for long. The real output was closer to 300 hp, and period testing backed it up, with a 0 to 60 mph time of 4.6 seconds and a quarter-mile run of 12.7 seconds at 113.1 mph.
Those numbers made the GNX quicker over the quarter-mile than the Ferrari F40 in period tests, a stat that still fuels its legend. Buick never meant for the GNX to be a volume car, either. It initially planned 500 units before extending the run to 547, all of them black and all built for the 1987 model year only.
The ASC McLaren Engineering Behind The GNX
Buick handed finished Grand Nationals to ASC and McLaren Engines, both Michigan firms. Despite the name, McLaren Engines was a separate company from the British supercar maker, though both trace their name to Bruce McLaren. The engine changes started with a Garrett AiResearch T-3 turbocharger with a lightweight ceramic wheel for faster spool, feeding a larger, more efficient intercooler. Revised engine management, a low-restriction exhaust, and a reprogrammed 200-4R automatic with a custom torque converter and cooler completed the drivetrain work.
The chassis changed too. ASC added a rear torque arm, a Panhard rod, and an extra frame crossmember to put the power down, plus fender flares with vents and 16-inch wheels. Inside, GNX-specific Stewart-Warner gauges included a 160 mph speedometer and a turbo boost gauge, a clear signal of the car’s intent.
Why GNX Values Keep Climbing
The GNX’s value comes down to a simple supply problem. Buick built 547 cars for one model year only, and many of the best survivors now sit in collections where they’re more likely to cross an auction block than a public road. Every car that disappears into a collection makes the next sale stronger.
For anyone still hoping to own one, the math is sobering. A driven, honest GNX now sells for close to $200,000, and a documented low-mileage car can cost more than double that. There’s no affordable way into GNX ownership anymore: only the choice between a driver and a time capsule, and both are getting harder to find with every sale.
Sources: GM Authority, Classic.com, RM Sotheby’s, Bring a Trailer.
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