N57 engine differences

[1867boy]

I'm told there is a difference between the N57 fitted to F10/F11 models pre/post 2013, even though the nomenclature is the same.
Is this correct?
If so what is the difference?

[Cambell]

Mate, I dont wanna start a whole "M Section" debate but you'd probably get a better response in the general BMW section here http://www.pistonheads.com/gassing/forum.asp?h=0&a...