The S2000's engine is a work of art, whether you're listening to it, looking at it, or feeling its power. It's a 237-horsepower, 2.2-liter four-cylinder with a red aluminum-alloy head cover and an oversize radiator, necessary for keeping the heat down when it's cycling at 7,500rpm. The engine uses Honda's VTEC variable valve-timing technology to help it put out more than 100 horsepower per liter of displacement.