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Buick GNX

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Buick GNX: Buick's most legendary muscle (1987). 547 cars total, turbocharged 3.8 V6 making 276 horsepower. One of the fa
Photo: Michael Barera / Wikimedia Commons · CC BY-SA 4.0

Buick's most legendary muscle (1987). 547 cars total, turbocharged 3.8 V6 making 276 horsepower. One of the fastest American cars of the 1980s.

The Buick Regal Grand National Experimental (GNX) is a limited-production muscle car produced for the 1987 model year only. The GNX was developed jointly with McLaren Performance Technologies as a focused performance variant of the Regal Grand National. Total production was 547 cars globally. The GNX used a turbocharged 3.8L V6 making 276 horsepower (factory rating, actual output likely higher). The car ran 0-60 in around 4.7 seconds, faster than contemporary Ferraris, Porsche 944 Turbos, and most production cars of the era. Black paint only. Various engineering refinements over the standard Grand National. Today, clean GNXs sell for over $200,000 at auction. The GNX has been one of the most appreciating American muscle cars over the past two decades. On WhipJury, GNX submissions are uncommon but always memorable. The combination of cultural significance, limited production, and unique performance heritage drives strong voter response.

GNX specifications

3.8L V6 turbocharged. 276 horsepower at 4,400 rpm (factory rating; actual output likely higher). 360 lb-ft of torque. Four-speed automatic transmission. Rear-wheel drive. Curb weight around 3,545 pounds. 0-60 in around 4.7 seconds. Quarter mile in 13.5 seconds. Production: 547 cars total (1987 only).

Frequently asked questions about Buick GNX

Why is the GNX so expensive?
Limited production (547 units total). Cultural significance as the fastest American car of the 1980s. McLaren Performance Technologies development. Strong demand from collectors of 1980s American performance cars. Clean low-mile examples have crossed $200,000 at auction. Even rough GNXs sell for over $80,000.
What is the difference between Grand National and GNX?
The Grand National was the regular production black-paint-only sport variant of the Regal with the turbocharged 3.8 V6. The GNX (Grand National Experimental) was the limited-production halo variant developed jointly with McLaren Performance Technologies. The GNX had different turbo, intercooler, suspension, and other upgrades over the standard Grand National. Only 547 GNXs were produced versus tens of thousands of Grand Nationals.
Was the GNX faster than a Ferrari Testarossa?
Yes, in straight-line acceleration. The GNX 0-60 of around 4.7 seconds was faster than most production cars of the era including Ferrari Testarossa (5.4 seconds). The GNX combined with relatively low weight and aggressive turbocharging was exceptional for an American sedan of the era.
Are GNXs reliable?
The 3.8L turbocharged V6 is durable when maintained. Common issues are typical for cars now 35+ years old: turbo bearing wear, age-related electrical concerns, and various wear items. Restoration parts remain available; the GNX is supported by specialty Buick performance parts suppliers.
Why was Buick performance discontinued?
Buick has not produced a significant performance variant since the GNX era. The brand has shifted entirely to crossovers and SUVs in modern North American sales. The Regal GS (Grand Sport) of 2018-2020 was the closest in modern times. Buick GNX-style performance development has not continued.

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