Here are three pictures that might help you make the decision. These are BMW promo pictures of a 4.8 with the sport package and Y-spoke wheel (214).
The front looks like it would be ok with the standard flares. The back may be iffy, but I guess you could always install the wider flares later.
For winter I installed the front all around and they are inset more in the rear than with the standard rear rim as these pictures show.
Hope it helps.