this turbo 100% not R34 N1 turbo,couse R34 N1 turbo got separate wagste at back of turbo and R34 V-spec2 use same turbo as R34GTR,no any different.hope it wil help.
the one you got more than likely are R32 N1.not Nismo turbo.
couse Nismo turbo's code are RR580 or RR581.