At its debut in Chicago, Mercedes-Benz touted its new S65 AMG sedan as the quickest four-door sedan in the world -- thanks to its hand-built 6.0-liter/604-horsepower twin-turbo V-12 engine - and promised 0-60-mph times of about 4.2 seconds. The S65 AMG sedan is equipped with an ABC active suspension that uses special AMG struts with firmer damping, as well as reworked ESP stability control and ASR traction control systems. To handle the awesome potential of the AMG engine, the sedan features high-performance internally ventilated and perforated 15.4-inch eight-piston fixed-piston brakes up front, with 13.7-inch internally ventilated and perforated four-piston fixed calipers in back. Staggered-size twin-spoke light-alloy AMG wheels (8.5x19 front, 9.5x19 rear) are wrapped in high-performance (245/40ZR19 front, 275/35ZR19 rear) tires for handling to match the output. AMG designers also blessed the sedan with subtle body enhancements, including a front apron with large cooling air intake and clear-lens foglamps, AMG sideskirts, chromed twin tailpipes, and chrome "V12 Biturbo" badging, for a distinctive appearance. Click to watch the Mercedes-Benz video.