First off, the vast majority of people you hear with those things on a Subaru just threw them on there without regard to how they make the car run. It's worth it to them I guess.
Now, if you want to move the MAF, that's possible. It's a custom job but not something particularly difficult. Of course you'll likely have to play around with the tune to account for all this. I've seen cars though where they move the MAF to AFTER the turbo which I question. It's easier for piping (usually on a lead to a FMIC) but the sensor wasn't designed for high pressure airflow monitoring.
2015 STi: Still Stock
04 STi, 04 WRX: SOLD