That looks like the hose that runs from the oil separator box, between two of the intake manifold runners, and up to the top of the engine. They're known for splitting open so the replacement part is slightly redesigned.

You will probably want, or need, to remove the turbo duct that runs over the top of the engine to give yourself some working room. The plastic cover on top of the engine needs to come off. The intake duct from the intercooler the throttle body needs to come off also - (4) 10mm hex heads attach the throttle body to the intake manifold. It may need cleaning by now anyway. The old hose will have an oetiker clamp at each each end that can be pried open with a screwdriver. The new hose can be held on with regular hose clamps.

This guy on Youtube replaces it without removing hardly anything:

https://www.youtube.com/watch?v=xJi6jjGuhSI

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Current rides: 2005 Volvo S80 2.5T, 2003 Volvo V70 2.4NA, 1973 Volvo 1800ES (getting ever closer to road worthiness)