Hi, there. I'm from Thailand.
BSI is real strict. If you swap or change any equipment, they won't include those or related materials in thier 5 years-warranty. Other parts don't count though.
New Bimmer's super smart. They know what you've done to them.
My take on this is 'do whatever you want' and don't care much about BSI.
Stereo for instance, If you drive > 30 hours a week, it's worth installing something neat!
No B&O at the price of $100K+ is silly.
PS. Why don't we have our F10 club in Thailand?