Have you got the m performance exhaust on yours then? Can't quite see from the pictures? Looks like the standard 125i one to me?
No, mine hasn't got the M performance box, only the one my 125i came with.
I looked at getting the M performance box, but at over 3 Grand + fitting here, I decided not to bother. I went for the M brakes instead.
My dealer did informed me some time ago that part of the delay in the production was that it included changes to exhaust components and auto boxes, so perhaps there is a redesigned or different back box in mine
I can only go on the sound it makes, which I like.