I was last there in 2009 with the BMW 2002 Turbo owners club. They had organised a private tour of the museum and the Welt. I found out after the fact that some of the jammy gits organised a tour of the secret stash of the full collectio, M cars, experimental cars etc. I was sick as a chocolate frog. Still it was a good day. Going to plan another visit soon.
Classic Hire:
https://www.bmwgroup-classic.com/en/...ermietung.html
Other Hire:
https://www.bmw-welt.com/en/experien..._pleasure.html
And some pictures of course