[barkster1971]

Once you have realised that your turbo needs replacing the next step is to have in your possession a replacement turbo. This is important! Make sure you have replacement turbo in your hands. The easiest option is to replace the 13c turbo with another 13c turbo.
Removing the turbo requires unbolting it from the exhaust manifold, the downpipe and the pipework going in and out of the turbo. The coolant feed can be have the jubilee clips removed after draining the coolant but the oil feed requires a 17mm spanner and access underneath to unbolt the two bolts securing the oil drain pipe.
You may want to get your turbo rebuilt and balanced or you may want to replace your turbo with a known good solid second hand one.
If you want to replace the 13c turbo with a slightly more fun one what are your options?
The second easiest option is to source a conical flanged 15g turbo from an early 94-95 Volvo 850 T5.
This requires some modification to fit!