it's not just the 26 that suffers from oil starvation, it's the attessa system that allows the GTR to corner harder
the 25 suffers the exact same oil starvation problem, however when it gets low in the sump the gtst doesn't produce the G's that the GTR does to slosh the remaining oil up agains the side of the sump and away from the pickup.
also a 25 sump will not fit on a 26 block as the pickups are in different locations. it's much easier to cut the front diff off. (i have a stagea 25 in a 33)