Is there any difference between OEM parts and factory fitted ones? I mean say lemforder arms that can be bought from an official dealer and the one you can buy from bmaparts?
Asking because one guy tells me that brake pads that Brembo supplies to BMW have a different make up, then the ones sold as OEM. That Brembo cannot sell exactly the same brakes to other retailers (due to copyright). That there are similar differences in other parts as well.