It's such a case of not knowing what you DONT have until you drive something that's sorted. I've lost the amount of times I keep banging on about diff's, especially the front for GTR's. They're not 4WD, they're 2.5 or 3 WD at best on comparison.
Everything you need has been posted on here many times.
Injectors are too small
So is exhaust
You'll need a different ECU to run the flex fuel gear
What clutch have you got? You MAY need to upgrade that if you're really turning the wick up.
Oil pump
Water pump
Gasket kit
Head service at the minimum
Head studs
Main studs
What will you be doing with the sump?
And don't forget a real front diff!!!
I still have the NISMO GT Pro in the rear of mine Ash. It's currently set at Medium which I feel is too much. I know you Racepace guys set it to soft and play around with the plates also? When the box is going in, I'll back the rear off. The extra friction plates in the transfer case will be getting done at the same time.
What ever happened to throttle control? Don't want to come on song, don't put your foot down. It isn't binary made up of 0's and 1's, throttle wide open or shut, mashed into the carpet or off it.
I had a bit of a sniff around, the 6262's largest (only) rear in split form is the 0.84. Its only the 6266/6466 that has the 0.84, 1.00, 1.15 and 1.32 AR