Originally Posted by mapezzul
You are incorrect in that assumption- The M135i has a forged crank and different rings additional cooling and of course software. There will more to the next version.
I don't mean to be argumentative, but has that been confirmed either by a tear down or by BMW? There is also a fair amount of controversy over whether the N54 had a forged crank versus the non-forged part in the N55.
I ask only to be informed, not because I think I'm right. I also added a note to my post so that someone won't read that "vanilla N55" comment and come away with the impression that it is factual.