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in laymens terms,
anything along the path that the air enteres the engine, maf, filter, tb, etc, that causes the pressure to drop at wide open throttle, will casue a loss of power that is proprotional to the amount of the drop in pressure, assuming the air to fuel ratio reamins constant.
if the drop is measured upstream of a turbo/sc, the increase in vacuum is calculated, if its downstream its a lost of boost pressure.
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