MotorTrend has a 2006 CTS Review that has some CTS-V spoilers. Among them is this:
Where BMW has "M," Cadillac has "V"--the performance pinnacle for the product range, with a comprehensive powertrain, chassis, and cosmetic upgrade. For 2006, the CTS-V moves from using the 5.7-liter/400-horse LS6 engine borrowed from the previous-generation Corvette Z06 to a 6.0-liter/400-horse V-8 transplanted from the new, sixth-generation Corvette. Rowed through six-gears with a manual Tremec transmission, the CTS-V can race from 0 to 60 mph in 4.6 seconds, leaving many fancy German competitors in its Motown dust. The fact that the CTS-V is cheaper than its Audi, BMW, and Mercedes competitors furthers its appeal.