The S-Class stable includes the S550 (available with rear-wheel or all-wheel drive), S600, S63, S65 and the S400 Hybrid. Virtually every comfort and convenience item comes standard, with a huge option list that allows the owner to personalize their vehicle. 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 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 new 5.5-liter biturbo V-8 engine. For the ultimate performance S-Class, the S65 AMG provides a biturbo 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. The S63 receives a new 5.5-liter biturbo V8 engine for 2011.