5. Buick Regal Grand National/GNX
The Buick Regal Grand National, introduced in 1982, was a turbocharged performance variant of the Regal, featuring a distinctive all-black exterior and a 3.8-liter V6 engine. (motortrend.com) The 1987 GNX, a limited-production model with only 547 units produced, was developed in partnership with McLaren Performance Technologies and featured a Garrett T3 turbocharger with a ceramic turbine wheel, a larger intercooler, and a reprogrammed engine control module, resulting in 276 horsepower and 360 lb-ft of torque. (motortrend.com) The GNX’s performance and unique styling have made it a sought-after collector’s item. (motortrend.com)