[deLux]

I get ~2.0X g/rev @ WOT (14.5 psi boost) and another 2.0T forester in the same conditions is getting like 1.8g/rev. Mine looks rich the other looks fine. Mine is lower on power, the other makes like 10 (engine) bhp more.

MAF rescale or replace?

 

[thefoos]

Based on the limited information, sounds like a tuning adjustment, not a sensor replacement.

You can either tune AFR's with the MAF cal or the open loop tables, or a mixture of the two. If your AFR's aren't matching the open loop table, the MAF probably should be adjusted.