I miss my old stock R32 GTS-t, but I tell you, the full factory RB20DET silvertop (including exhaust) was a bit of a struggle until you want past 2,000rpm (coming from an Aus-del R31 with RB30E).
With my GT-R, anything below 2,000rpm is a clutch-in scenario.
With my limited experience with NEO6, I can say anything below 2,000 rpm is a struggle (seems to be a common theme with turbo engines).
Even with my BMW B48 (F45 FWD 2-series hatch), anything below 1,500rpm is a struggle, so keep those revs up!