The 1987 Buick GNX is the perfect definition of a sleeper. Under the humble, unassuming looks of a regular Buick Regal hides supercar-shattering performance, all thanks to the GNX's innovative power plant. Can you guess its engine?

Developed in collaboration with McLaren, the GNX was the fastest American car one could buy and the second-fastest car in the world at the time after the Porsche 911 Turbo. Its incredible 0-60 time of only 4.7 seconds was achieved thanks to the 3.8-liter turbocharged and intercooled V6, rated for 300 horsepower.

Asked by Vasilii Kulev · Last updated 5 years ago · 91.5K views · SOURCE