Thread: boost bypass valve? vaccum line?

so on the bbv there is a vacuum hose going into it on the left side. but it looks like on the right side of the bbv there should be another vacuum line going into it? because there isnt one on my car and i have been only getting "one less bar" of boost on the display. anybody feel free to help out or pop your hood and tell me if there IS only one vacuum line going into it from the left.