My car's a 2012 e92 (us spec) and I pushed her till the engine was cutting out, right at 170mph. I was hoping mine wasn't limited by bmw but...damn
I can report that the car felt very composed at those speeds, i was more worried about the traffic. The car did bounce a bit at very high speeds so I set the suspension to normal (down from sport).
It was a cool experience, playing with the merc. No hint of fast-n-furious let's race to see who's d$ck is bigger. It was just two finely engineered German machines meeting and dancing in "their element" ... It was bliss and this car truly is epic.