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That line you were holding in that last picture is the BOOST LINE that goes from the intake manifold to the ALDA. The hissing you are hearing is probably air whistling out of the opening in the intake manifold when the turbo rev's up. I would bet 100% thats where the "swooshing" sound is coming from....a lot of air will whistle out of that hole when the engine is under load, the turbo is building a strong air charge and that hole lets it escape. The oil leak is probably a bad seal on the filter canister....
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