Buick Regal GNX
The 1987 Buick GNX (Grand National Experimental) represents the pinnacle of turbocharged V6 performance and the swan song of the legendary Grand National. With only 547 units produced, the GNX was a collaboration between Buick and McLaren Performance Technologies (ASC/McLaren), creating what many consider the greatest American performance car of the 1980s.
McLaren extensively modified the already potent Grand National, upgrading the intercooled 3.8-liter turbo V6 with a ceramic turbocharger, low-restriction exhaust with dual tailpipes, special PROM calibration, and improved intercooler. While Buick conservatively rated the engine at 276 horsepower (to maintain insurance-friendly numbers), actual output was estimated closer to 300 hp. The massive 360 lb-ft of torque made the GNX a devastating straight-line performer.
The performance numbers shocked the automotive world. Car and Driver tested a GNX at 4.7 seconds to 60 mph and 13.5 seconds in the quarter mile - faster than contemporary Corvettes, Ferraris, and Porsches. The GNX achieved this with an automatic transmission and a six-cylinder engine, humiliating V8-powered exotics. The chassis received extensive upgrades including revised suspension geometry, Panhard rod, torque arm, special springs and shocks, and 16-inch aluminum wheels with Goodyear Eagle VR50 tires.
Exterior identification included black paint (only color available), unique fender vents, special front air dam, rear spoiler, and special turbine-style wheels. Serial-numbered dash plaques marked each car's production sequence. The interior featured gray cloth seating and comprehensive instrumentation including a turbo boost gauge.
As the final evolution of the turbocharged Buick V6 program and the last hurrah for GM's rear-wheel-drive G-body platform, the GNX has become one of the most collectible modern muscle cars. Low production, documented performance, and unique provenance make GNXs highly valuable, with pristine low-mileage examples commanding six figures.
Verify authenticity through VIN and serial number plaque (should be 001-547). All GNXs were black with gray cloth interior. Check for documentation from McLaren and original window sticker. Engine should have ceramic turbocharger and dual exhaust. Suspension should have Panhard rod and torque arm. Original turbine wheels should be present. Low mileage examples command huge premium. Many clones exist, so documentation critical. Original unmolested cars most valuable. Even high-mileage GNXs worth significant money due to rarity.
Only 547 GNX produced, all in 1987. All were black with gray interiors. Each car was a Grand National sent to ASC/McLaren for modification. Serial numbered with dash plaques 001-547.