1. 1987 Buick GNX
The 1987 Buick GNX is the ultimate sleeper, cloaked in understated black sheet metal but packing a turbocharged 3.8-liter V6 producing 276 hp and 360 lb-ft of torque. Its brutal acceleration allowed it to outpace Corvettes of the era and even challenge European sports cars, all while flying under the radar. The GNX’s subtle styling and immense power have made it a legend among muscle car fans. Read more about the GNX here.