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There's two MAFs, bank 2 has the primary turbo, bank 1 has the secondary.
If you leave the engine idling for a while, the 2nd turbo will kick in until you touch the throttle again, I don't remember the reason why but it's normal.
Typical MAF values at idle with AC on;
Cold start, primary turbo only
Bank 2 ~23g/s
Bank 1 zero
Warmed up, primary turbo only
Bank 2 ~15g/s
Bank 1 zero
Warmed up, with 2nd turbo active
Bank 2 ~10g/s
Bank 1 ~8g/s
MAF rates while driving are hard to quantify but the idle rates should be pretty consistent.
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