You'll see more of an improvement from doing the VE. (and if your '06 E40 runs like my '06 E40 with the MAF failed, you will take it off and stuff it...
I mentioned before I have been taking courses for HPTuners. I Tuned my MAF sensor today and followed the course to a T...To be honest I think I fixed...
They are universal, even credits are now universal. It sounds like he is talking about the credits he used which doesn't matter since they are locked...