Originally Posted by roo
Do you really have less air flow, part of the gains from switching from 8 to 4 is to lower pumping losses by opening the throttle up plate further. I do agree that the stock setup has more than enough flow for part throttle operation and more than likely WOT operation also. The RAM air box is pretty nice as is.
The reduction in overall air mass flowing will be proportionate to the increase in efficiency, since the computer maintains the fuel/air ratio. If the MDS increase your mileage ( if ), then you have consumed less gas and air.
The small technical negative that offsets this regarding an intake/filter is that when in MDS mode the slightly reduced air mass is now required to be drawn in by 4 widely spaced pulses of air mass acceleration/deceleration instead of a closely spaced 8 vacuum event which normally gives a smother slower overall airflow.