Chevrolet Cobalt SS
Although they discontinued it, the Chevrolet Cobalt SS was one of the best, most powerful four-cylinder cars. Available as a supercharged, turbocharged, or naturally aspirated model, the best SS was the turbocharged 2.0-liter four-cylinder they introduced in 2008.
The engine delivered 260 HP, which was astonishing by the standards of the day and more than any of its competitors. It also had a cool sound.