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I end up using multiple honeycombs in intake tracts to calm the tumbling that can occur. When you alter a known good transfer function you will find it isn't accurate at different temps, barometric pressures, altitudes, humidity, etc.

Big camshafts and bad exhaust sometimes require the distance to the MAF to be changed to further away and if packaging doesn't allow this, time to switch to speed density. Sometimes a switch to e78 or e92 computers that allow dual MAF's is an option too.