From what I can see and have always been told you can't scale the maf with a tuner, you need an afc for that. You can't change the hz with the tuner you need an afc for that. My fuel trims aren't correct right now anyways so they need to be tuned. When my maf is putting out a reading of say 20,000 hz I want the pcm to read it as 10,000 hz so I am still under 11500 hz on the pcm maf table. There is no way of doing this with the tuners. As far as I know pretty much every turbo car running over 10psi is running an afc or larger maf. Also from what I have been reading there isn't a maf that will not be out flown my 20psi+ if so they probably cost more than an afc. I could be wrong about all of this so if I am explain how you can scale the maf with a tuner.

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Red 2dr 99 GTP: Z7 t66, A/A IC'd, Custom Heads, 65# Inj, ST2 Cam, Meziere Elec Pump, JP Double Roller(with machined crank gear), Plogs, PLX W/B, Powrtuner

99 Regal GS (work car)