With tender care Thats my car black four door, though I'm on the hunt for a guard roller as even with stretched rubber they do rub a little. IMO I think it just helps to improve the look of car as I've never been a fan of the sunken look!
From what I've read all GTR's from factory are:
R32 GTR = 16 x 8 +30
R33 GTR = 17 x 9 +30
R34 GTR = 18 x 9 +30
Though R33 and R34's do have apparently more guard space and can fit even lower than +30> and still have no problems with clearance..
I haven't ever tried my rims on a 34 I am sure you will have a similar situation to me and also have the same width all round you may find a small amount of tramlining if you have the same size tyres. though that can be cured with wheel alignment and or run 225/235 front and 235/255 rear depending on the style your after?
Cheers
Phill