My 2012 Perf pack, which is stock except for exhaust, won't go past ~115. You all have to remember that the speed limiter has little or nothing to do with 1 video posted on youtube of some guy's driveshaft failing. The speed limiter has to do with insurance. It's just one of the reasons the V6 has pretty reasonable insurance for a 300HP sporty car.
I wonder what an insurance company would do if someone crashed at >115MPH on a tuned car. My guess is the insurance company wouldn't cover it. Of course, you'd probably be in jail so you'd have other things to worry about.