So now it’s running well with new MAF in bank 1 and old MAF in bank 2, but still with bank 2 rich code. That you’re getting a CEL means it’s occurring often. If it was only occasional bank 2 rich pretty sure you wouldn’t get a CEL. Injectors are a definite possibility, but I’d also pull the air box and check as much of the airflow path from the turbo outlet to the intercoolers to the intake manifold as you can. Like you found the turbo inlet tubes basically hanging there, you may find another obvious thing allowing air to escape.
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