Well weight is against you take out the seats, sound deading, angle grinder to the doors no back bar or side skirts and any think else thats not welded down.
JB clutch $1200
3 stage 150shot per stage NOS system
Why has no one done this stock Rb26 4-6k replacement value and you have just kill a good GTR. All so the Z tune could do it maybe with a tick of Nos