The S550 can seat up to 5 passengers in its 4-door cabin. Its 5.5-liter V8 sends 382 horsepower to the wheels through a seven-speed automatic. Buyers can choose between a rear-wheel drive, or all-wheel drive configuration. Both offer extremely high levels of standard equipment, befitting the mark. Virtually every comfort and convenience item comes standard, with a huge option list to ease customization. Safety features include multiple airbags, stability control, tire pressure monitoring and Pre-Safe accident-readiness. The top-of-the-line S600 is powered by a 510 horsepower 5.5-liter, twin-turbo V12 engine mated to a heavy-duty five-speed automatic. Equipped with exceedingly high levels of standard equipment, the S600 has advanced features such as front and rear automatic climate control, Parktronic front and rear parking radar system, and Distronic radar-controlled cruise control. For the performance oriented driver, Mercedes offers two models; the S63 AMG and the S65 AMG. The S63 AMG features a 518 horsepower 6.2-liter V-8 engine. For the ultimate performance S-Class, the S65 AMG provides a 604 horsepower, twin-turbo 6.0-liter V-12 engine. Both enhance their sporting aspirations with features such as 20" performance tires and AMG-specific bucket seats. Specially tuned computer-controlled ABC active suspension system with AMG shock absorbers delivers decidedly sharper handling characteristics.