With 10 cylinders, BMW has given new life to the term "performance sedan" with its 2006 M5. "Push the start button on the 2006 BMW M5 and there's a slight delay before the engine fires as if to hint at the complexity you're about to set in motion with your finger," wrote one reviewer. The 5.o liter engine is capable of producing 500 horsepower, depending on settings and options. A seven-speed, sequential gear box is standard, helping operate those 10 cylinders (which lend the engine a "tinny" sound when idling).