Got my louiellp carbon diffuser on. Fitment was 99%. You can tell there's a slight gap on the driver side if you look at it from less than a foot away but my car is black so from further than that you can't tell. Insurance was paying for it so had it just put on by a BMW dealer body shop. Not sure if they modified it in anyway.
All I can say is wow what a difference in looks! Its now flush with my Maddad V1 exhaust. Can't believe I left the stock piece on for so long.