2. Buick GNX
At first glance, the late-1980s Buick GNX looked like a standard Regal coupe—hardly intimidating. But under its unassuming skin lurked a turbocharged V6 that delivered shocking acceleration, allowing it to outrun even the mighty Corvette of its day. This stealthy beast quickly earned legendary status among muscle car fans, thanks to its raw speed and rarity. MotorTrend celebrates the GNX as one of the greatest sleeper cars ever built.