Could upgrade to a new Link G4. Much better then the old PossumLink's.
But, installation and tuning will be upwards of $3000 I would say.
Or buy a new Air flow meter and fit a factory ECU, much cheaper. Then get it run on a dyno to see if its running safe.
I'm pretty sure the wiring would still be there.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i