Actually the offsets aren't that aggressive really. The GTR uses 20x9.5 +45 front/20x10.5 +25 rear. The diameter is the "aggressive" factor; although I wouldn't call 20s on a sports coupe aggressive lol. I haven't seen anyone do this yet, but here's an idea of what you'll be working with.
This car is on 20x9.5 +10 front, 20x11 +5 rear. The stock GTR wheels would be inset (sunk in) 35mm/1.4" in the front and 26mm/1.02" in the rear.
Depending on the specs of your current wheels, you may lose clearance on the inside when switch to GTR wheels.