http://www.m3forum.net/m3forum/archi.../t-427444.html
Good enough for me. I read it on the internet so it must be true.
Please feel free to research liberally if you are looking for more answers and need affirmation.
But yeah, I really just want to know the story of the S55 beyond all uncertainty. Amazing how much mystery this car has provided us, eh? Every time we learn more, we realize still how little we know.