Volkswagen Passat/Audi A4 with a V630 valve vacuum hose routing diagram hopefully this helps someone One day because google doesn't help : r/ Volkswagen
Vacuum line diagram, ecu removal, and bad ecu fix on jetta passat or add a performance chip
Finally found vacuum line tubing | Volkswagen Passat Forum
VACUUM HOSES audi seat skoda volkswagen BKC BXE - YouTube