I've done some research and according to this thread at,

http://www.automotiveforums.com/vbulletin/t91193.html

, fitting supercharger to your car, espcailly from manufacturer like VF Engineering that is SEMA member, should not void new car factory warranty.

Looks like BMW is also a SEMA member.

This is really interesting piece of information (at least to me, since until now i haven't heard of SEMA stuff, not really show what they are about, sort of like consumer protection agency for automotive industry???).

Anyone has any comments, feedback, opinion, experience on this?

Thanks much!