That what I did and worked well. There is gains under 15 but not huge. For example I couldn't get over 18psi without pulling heaps of timing on my 2.5 on 95.with meth as well I could run 27-30psi quite happily.
So I've done some more research on the nz new gt. They are the Japanese spec same as jdm not adm like the 3.0r. Including the heated seats (leather) and rear fog light.