I no longer have the m62 in my 2000 540it, but I've got one vacuum line that I don't know what it does. It goes from where behind the intake manifold would be, it appears I left a yellow circular clip on it at this part. It's rubber here as well. If I remember right it travels to the drivers side, under the cabin filter and down through that area and either out the body or into it. I'm not sure. Just disappears into the floor of that compartment.