For the first time since I own my M (03/12), I finally taken it to Top Speed yesterday.
Long story short, an 08+ black M sped and cut off my wife (she was 3 cars ahead of me) on ramp going to the freeway.
I knew that he saw me at the light but didn't expect him to cut us off like that, so I got pissed and chased after him.
I pulled up next to him, down shifted to 3rd, let the M screamed on him (he was shocked by the sound) and smoked him going 140+ still climbing but had to slow down due to traffic.
http://www.youtube.com/watch?v=DFSG8KfIvBY