My father was “ stoplight” street racing in in the 60s. He was against some street rod and my dad was driving in a 289 cobra. My dad whipped him. When they met up my dad said the other drive knew he was beat when my dad shifted into second around 50 mph.
Hmmm...In the M3, if I were to wait until I was going 50mph to shift into 2nd gear, I'm quite sure I would have blown the engine. Never took the chance to find out!;)