Don't waste your time on R33 N1 turbo's.
"Laggy" / Old technology.
Go the Garrett -7 / -9.
Both are Ball Bearing and have Steel Internal Cores.
-9's will give you slightly more top end.
If you are aiming for 320 rwkW', from memory, -7's max out at about 330 rwkW's... Or go the -9's for the slightly more top end if wanted.
From memory -9's max out at about 350 rwkW's.
Go for a Nistune or an APexi Power FC for further tunability.
Or whatever your mechanic / tuner is good at / knows what.
All good!
No need.
And Excedy Single Heavy Duty will do you fine.
I hear good review on the Nismo Coppermix Twin Plates.
So either one will be good.
Whatever your mechanic / tuner is good at / knows what.
If they are good at Haltech / Adaptronic, then use it.
Only if they need replacing.
I think that's correct...
A Single Heavy Duty will be fine for 320 rwkW's.
R34 GTR N1 Turbos = Garrett -7's.
There are variations in the Compressor Housing / Compressor Wheel but the Measurement Specs are all the same.
Don't risk it with 2nd hand Turbo's Just buy a new set of 2.
Worst case scenario, you want to save the few hundred dollars by buying 2nd Turbo's, you can end up with an engine build of $10K+.