It's 556HP and a 1/4 mile of 12.0 and it is a sleeper for starters it looks just like the standard CTS for the most part, It does have CTS-V badges, it has a ground effects kit and a different grille and rear/front bumpers. Also the fact you said you don't even know what is means you could be sitting at a light next to one and have no clue what it was, That is the defintion of a sleeper.
lol 12s at the strip maybe. good luck hooking that on the street. Ill take a gtr and run low 11s with a tune for the same price. Not even a contanst on the street. Big power rwd cars are just to scary on the street. You hit one bump in the road around a turn or something you're done.