Originally Posted by pitfield
Aerodynamics might be better and it also has 7 gears.
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Apparently the CTS-V has a Cd of 0.31 vs. 0.30 for the E60 M5. Furthermore, there are a number of cars now that have 8-speed trans, and I haven't heard about any of them having this type of 'two-stage' acceleration profile. It's almost like they torque-limit the engine until it's in 5th gear or something.
GTBoard (aka M5/6Board) set up there whole drag sequence to take advantage of this characteristic (i.e. 50-260 km/h).