I honestly don't know why someone would take a chance on a $400 rep bumper + shipping when the OEM BMW part is only $100 - $150 more.
JGmods is $520 shipped
For $100 more you can get the OEM part with OEM diffuser, if you shop around - even tischer shipped is $670 and it is OEM and will fit perfect.
You can get the OEM bumper for $545 shipped and the OEM diffuser is only $90, so total of $635.
http://www.ebay.com/itm/BMW-OEM-11-1...item33937c68c8
Like someone else said, if you are going to do a rep, just get it on ebay for like $250 then it is worth doing.