Well, I removed my Msport 313's today to fit my winter wheels. They are definitely original OEM as they have not been off the car since brand new.
There were no BBS markings at all on any of the rims. Just part numbers and BMW.
But I know my previous 313s (which were Performance not MSport) had BBS stamped on all 4.
Maybe they have changed at some point, my previous wheels were 2009, current are 2012
2012 Alpine White E92 335d M Sport LCI | Coral Red Dakota Leather | Media Package - BMW Professional | 313 Wheels | Evolved |
Previously - 2009 Alpine White 325d M Sport LCI | Auto + Paddles | Media Package - BMW Professional | BMW Performance Front, Sideskirts and 313P Wheels | Black Grilles |
Carbon Black E46 ///M3 '04 | Manual | Evolved |