Impedance was poor wording on my part and I'm not disputing any of what you guys above are saying or Motorking's data, but those pressure/GPM numbers are based on a specific test sample. There's probably 100 or more different sized filters and so many other variables at play in terms of oil, oil condition and temperatures, it's difficult to say one style media benefits an engine better than another in a full flow filter application. I thought that's what this thread was about, but could have missed the mark.
Not quite sure where the disconnect is so let me try to address your comments and let me know if I'm tracking what you are meaning.
The pressure and flow are not coupled in respect to the filter.
The pump is putting out "X" flow (volume) at "Y" RPM ( assuming no suction starvation) regardless of temperature, viscosity, whether its pumping -100w-9000 all purpose weapons grade uni-oil or semi frozen caramel and the filter has nothing to do with that.
The system pressure ( resistance to flow) is based on the size of the passages, length or run relative to flow, tolerances, surface finishes etc. ( which is why when parts wear, pressure decreases and generally pressure increases some with RPM)
"Full flow" is a marketing term and meaningless. Basic fluid dynamics comes into play here. As a filter increases blockage- the areas that are not blocked increase in flow velocity to compensate leaving a net 0 delta in terms of volume flow on either side. ( as measures in front and behind a filter)
The bypass valve is nothing more that a spring loaded cap that when it gets to the stress of the spring it opens allowing bypass- still a net 0 delta in terms of flow volume.
The media ( selection, type and material/construction) has no bearing on either of these- just on how much it can trap until it builds internal pressure where a bypass opens