26/08/2008 08:31. MILFORD, Michigan — When Inside Line learned it would have access to a 2009 Cadillac CTS-V at GM's Michigan proving grounds, we packed up our portable Racelogic VBOX III testing gear and booked our staff hot-shoe on the next flight to Detroit.

After spending time behind the wheel of Cadillac's powerful new sport sedan, we weren't disappointed. The 2009 Cadillac CTS-V, equipped with a supercharged 556-horsepower 6.2-liter V8 and a six-speed manual transmission, accelerated from zero to 60 mph in 4.6 seconds (4.3 seconds with 1 foot of rollout like on a drag strip) and crossed the quarter-mile in 12.5 seconds at 115.3 mph.

That's a faster quarter-mile sprint than either the 500-hp 5.0-liter V10-equipped 2007 BMW M5 or the 507-hp 6.2-liter... // Edmunds.com/Inside Line