AudiRS6 Twin-turbo 5.0-litre V10 gives class-leading power of 580hp but is mated to ordinary six-speed automatic. The 0-100kph time is 4.5sec.
BMWM5 The meekest here with a normally-aspirated 507hp 5.0-litre V10 and jerky seven-speed robotised manual. It's slowest at 4.7sec.
CadillacCTS-V The 5.0-litre V8 may only produce 556hp, but supercharger helps torque peak out at 747Nm _ 97Nm more than RS6's _ for a better 4.0sec.
Mercedes-BenzE63 AMG Comes with a normally-aspirated 6.3-litre V8 transmitting the 507 horses via a seven-speed automatic for a 4.5sec time record.
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