Turbo problems/replacement

Hi, I think the turbo has gone, There was a bit of a bang and then the engine wouldn't run properly. The EGR was opening at idle and the engine 'hunting'.
As a temporary measure the connection to the inlet manifold from the EGR was blanked off. That at least made the vehicle driveable.
The engine now revs fine but is down on power. I need to replace the turbo (preferably with a re-manufactured one) as I am on a low income. A new EGR doesn't look to be too expensive.
It has been suggested that I just replace the internals of the turbo with something like this :

Turbocharger Cartridge Land-Rover Freelander Evoque 2.2 TD4 Turbo Core Upgrade.​

It has always been my understanding that a repaired turbo needs testing and balancing before it can fitted to the vehicle, so I am somewhat confused at the suggestion that I fit the internal part to the turbo myself without any testing. I also have to clean the gunge out of the inlet tract too. Any suggestions as the best way to do this? I am new to Freelanders. Thanks in anticipation. Andy

I'd be checking the boost hoses before going down the turbo route. The turbos on these engines are generally good for at least 150k miles, and often good for the life of the engine.

Boost hoses on the other hand fail quickly, especially the front short hose to the throttle body.

In answer to your turbo question, no a core or rotary assembly doesn't need balancing, but the turbo does need calibration using JLR test equipment, and and air path calibration also needs to be carried out, even if an EGR valve is replaced

Thank you Nodge.