i thought gtr rear swaybars were 25mm hollow with 2.5mm wall thickness.
if they are, they are 250% stiffer than stock gts-t swaybars
if they are 22mm hollow with 2.5mm wall thickness they are 130% stiffer.
so either way is quite a good upgrade compared to the stock 16mm rear swaybar
the front shouldnt fit as the gtr front subframe is different to accomodate for the front diff.
guess you could make it fit though, you're probly better off just getting whiteline swaybars for front though
and anyone looking for a really cheap upgrade, look at s13 swaybars (rear fits, not too sure about front). rear is 20mm hollow which is 44% stiffer than stock swaybar
and fairly sure the front bar isnt hollow, well on the gts-t is is solid, so assume the gtr is also solid, around 22mm. measured once with verniers, but forgot exactly how much