This 1987 Buick GNX is #212 of 547 produced for a single model year and is powered by a turbocharged 3.8-liter V6 paired with a four-speed automatic transmission and a limited-slip differential.The 3.8-liter V6 was modified by ASC/McLaren with a Garrett T3 turbocharger under a GNX-branded shroud along with a larger air-to-air intercooler and a low-restriction exhaust system.Factory-rated output was 276 horsepower and 360 lb-ft of torque.A tune-up was performed in October 2022.Power is sent to the rear wheels through a Turbo-Hydramatic 200R4 four-speed automatic transmission with a factory-upgraded oil cooler and a limited-slip differential that features a GNX-branded aluminum rear cover.The Grand National Experimental was created in partnership with McLaren Performance Technologies/ASC to celebrate the end of the vehicle’s production run, and all 547 examples were finished in black.Cosmetic details specific to the GNX include heat-extracting fender vents, composite wheel arch flares, a three-piece rear spoiler, and GNX badging.Additional exterior details include an automatic power antenna, a rear window defogger, sport mirrors, and dual exhaust outlets.The 16″ cross-lace wheels are wrapped in Futura Ultra Z tires measuring 245/50 up front and 255/50 out back.The GNX features front suspension components from the contemporary Grand National, and upgraded rear components include a Panhard rod, torque arm, and an additional frame cross member.Braking is handled by power-assisted front discs and rear drums.The cabin features front bucket seats and a rear bench upholstered in black and Sand Gray cloth, with Turbo 6 embroidery on the front seat headrests.Additional amenities include a power-adjustable driver’s seat, air conditioning, cruise control, power windows, and a Delco AM/FM/cassette stereo with a graphic equalizer.A plaque mounted to the passenger dashboard identifies this car as GNX #212.The three-spoke leather-wrapped steering wheel fronts GNX-specific Stewart-Warner instrumentation consisting of a 160-mph speedometer, an 8k-rpm tachometer, and gauges for boost pressure, oil pressure, coolant temperature, and fuel level.The five-digit odometer shows 4,400 miles.