Beat the M3 here too:
http://www.fastestlaps.com/laptimes/4ca79a3c1ebd6.html
Is it faster on every track? Probably not. Will the driver make a difference? Always - no matter the car.
Point is the CTS-V can hang and you kind of just popped off at the mouth, for whatever reason, before you knew much about it. It's okay bro. Your car is still awesome but I assure you that there's always someone/something faster.