3rd gear 55mph with 4.77's is around 6k my vtec is set at 5600rpm's I know what kind of cts it was I used to work at cadillac and I've driven more than a few of them they're not that quick. I have pulled a c6 vette. You'd be surprised what kind of leverage 4.77's will give you esp. 1-3rd.

 

My friend said that the ctsv runs 13.6 in the 1/4 I ran a 13.3 with a slippin clutch I thinks that's a good 2 cars. Its got a vette motor but its not a vette