Cadillac's M5 killer spied

The Cadillac CTS-V is plenty fast. It has no problem hanging with the E39 BMW M5 -- the vehicle that was on the market when the CTS-V was unveiled. But there's one problem -- BMW replaced the old M5 this year with a new 500 horsepower V10 version. That leaves Cadillac pretty far behind in the horsepower race. But if new spy shots from KGP Photography are any indication, that could be about to change. According to the report, the car pictured will get a new wide bodykit and a the 505-horsepower, 7.0-liter LS7 V8 from the Corvette Z06.