Had a 550i run me last nite. I think we both surprised each other. Race started at around 70mph. I honestly wasn't expecting any fight whatsoever, but this guy had some upgrades. I ended up pulling a few car lengths or so by 5th gear. When we pulled off the fwy next to each other, he asked if I was an M5. LOL. To his defense it was dark and he said he was running 550whp with a twin turbo setup his buddy did. I told him I was a 3 series (which I'm sure he saw after I pulled away). He was blown away that a 3 series could have that type of power. I think he was even more blown away when I pulled my iPad off the dash and said I have a pure stage 2 turbo and a jb4 piggy back tuned "with this iPad". He was trippin to say the least.
Anyway, guys.. That top end power is insane.. Real world stuff right there.