http://www.installationinstructions....egate_hose.pdf
Looking at replacing some vacuum lines. In reference to the ones shown in the diagram in the link above (the same ones the OP described), I found the one that goes to the turbo itself unattached. The hose itself was old and didn't stay on very well so it probably just slipped off. My question is what specifically is the purpose of this vacuum hose and what can happen if detached?