How does the 2006 Cadillac STS-V compare to the regular STS?
The base 2006 Cadillac STS is equipped with a 255-horsepower, 3.6-liter V6 and starts at $41,770 including a $720 destination charge. A 320-horsepower, Northstar V8 model is also available with a sticker price of $48,240. Both versions include front side and side-curtain airbags, OnStar communications, leather upholstery, a Bose sound system with XM satellite radio, and numerous other standard features. The STS-V comes fully loaded at $77,090 with 469 horsepower.

In terms of power and price, how does the 2006 Cadillac STS-V stack up against the BMW M5?
The 2006 Cadillac STS-V, powered by a 4.4-liter supercharged V8 putting out 469 horsepower and 430 lb.-ft. of torque, is fully loaded and sells for $77,090, including a $720 destination charge. The 2006 BMW M5 puts out 500 horses and 383 lb.-ft. of torque and carries a base price of $81,895, including a $695 destination charge. However, the BMW has a much longer options list including some items that are standard on the Cadillac, like a power sunroof and a heated rear seat, and others that are unique, such as a heads-up display, and rear side airbags.

Is the 2006 Cadillac STS-V fun to drive?
Absolutely. There’s gobs of power to have fun with, the suspension and tires keep things steady on those hard-core back roads, and the stability and traction control systems err on the side of safety yet aren’t the least bit intrusive. The only suggested improvements include heavier, more responsive steering at speed, and more V8 growl to drown out the supercharger.