The 2003 Mercedes-Benz S-Class, heading into its fourth generation, solidifies its position as the flagship luxury sedan of the brand. Available in four trims - S430, S500, S600, and S55 AMG -, this high-end sedan is mostly known for its sublime ride quality and high-tech interior. The S430 and S500 both boast a rear-wheel drive system with optional 4MATIC all-wheel drive, whereas the S600 and S55 are only available in RWD. Engine options span from a competent 275-hp 4.3L V8 in the S430 up to a powerful 493-hp 5.5L V12 in the S600, offering an impressive blend of luxury and performance. The S55 AMG, on the other hand, is a performance-oriented model with a 5.4L supercharged V8 with 493-hp. With safety featuring prominently, the S-Class models come equipped with ESP stability control, brake assist and multiple airbags as standard. Inside the cabin, you'll find an innovative COMMAND system with navigation and a BOSE premium audio system, all adding up to a relatively tech-forward offering for its time.