Pic 1
http://www.realoem.com/bmw/showparts...24&hg=11&fg=40
Pic 2
http://www.realoem.com/bmw/showparts...84&hg=11&fg=15
Hose 5 in Pic 2 connects to tinny nipple on Part # 9 for pic 1. I guess that would be primary suspect. Mine was in really bad shape because of heat and age of course. There are couple more thin hoses like that, inspect all of them. ICV hose is fat one and less likely to fail. Also check connector part number 9 in pic 1 and replace o-ring (part#10) in pic 1.
Hope this will help.
Akhil