I'm also having vanos issues at 29k miles. I am taking off all my mods and taking to a dealer. I have a permanent check engine light right now and codes pointing to a vanos failure.
Selling everything for 1350$ + your stock exhaust(local) and set up a time to go uninstall install on a weekend when i don't work. (extremely cheap. )
Current: 2016 bmw m3
Past: 2013 bmw 335i, 2011 bmw 335i coupe