I remember there was a Manhart racing visit post a while ago on 1addicts. It pictured a customer n55 1 series being worked on. They were to turn it into a twin turbo setup. It has also been said in that post that the guys at Manhart mentioned the upcoming Alpina will have the same treatment.
unfortunately this thread is gone now...
http://www.1addicts.com/forums/showt...=727559&page=5
here is a little discussion on that topic that has develoiped:
http://www.e90post.com/forums/showthread.php?t=738756