I would start by cleaning the erg valve and manifold. Biuld up of muck here will effect airflow and hence the mas airflow reading.
I would think your problem is on the intake side rather than the exhaust but the turbo may be passing oil so a look at that would not be amiss to determinensure it's condition.
Once all pipes, valves are clear then an assesment of the situation can properly be had.
The broken bracket will need fixing but I doubt it is the cause of the problems. As I said I would look to see how much muck is in the manifold, I'm sure there's a video on how to do it on here, possibly one of simons, Cheshired5.
Paul.
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