Detroit 2008: Cadillac displays CTS-V, Provoq and CTS Coupe Concept (video)

There was a time when horsepower ratings around 300 were enough to qualify a sedan as being really, really powerful. Thankfully, those days are gone- and the upcoming "V" designated Cadillac CTS expands on the style and performance of the standard V6 model with a supercharged engine and a whopping 550 horsepower.