The Plaque on the Turbos State...
14411-06U00 Which is the Nismo 32 Serial Numbers which Correspond to A/R .42/.64 Housing & 560Ps Output.
But these have been measured by Precision Turbos in Wetherill Park to be same as NISMO RS581 GT Le Mans ~640Ps Spec units. (Balancing Markings Still Visible)
Same Spec as HKS2530 & 2860-5 But Bush Bearing not Ball Bearing,
marginally less responsive for street application but for track application very good as they are more forgiving than ball bearing units and also much cheaper to rebuild should the need arise As BB units are basically buy new turbos minus the housings...
Below are specs of Nismo RS581 GT LM & HKS 2530 (2860-5)
Nismo GT Le Mans (14411-RS581)
Compressor Housing T04B
Compressor Wheel T3
Compressor Wheel (mm) 47.2 - 60.1
Compressor Trim 55T
Compressor A/R 0.6
Turbine Housing T25
Turbine Wheel T25
Turbine Wheel (mm) 47.0 -53.8
Turbine Trim CD79
Turbine A/R 0.64
Cut back 15°
Bearings 360°
As pair ~640PS
HKS GT2530 (2860-5)
Compressor Housing T04B
Compressor Wheel T03
Compressor Wheel (mm) 47.7 - 60.1
Compressor Trim 63T
Compressor A/R 0.6
Turbine Housing T3
Turbine Wheel GT25
Turbine Wheel (mm) 47.0 - 53.8
Turbine Trim 76T
Turbine A/R 0.64
Bearings BB
As pair ~640PS
These will easily do >400KW as can be seen on RB26 Thread with right setup & tune.
Hope that's enough information but here's a few photos.
They are a bit dusty but they are in great condition with no radial (side) play, thrust (forward/back) play, no scraping & no chipped or bent blades.
Can take close up of wheels if needed
Price: $1400 Delivered for Turbos & Braided Lines (I Payed More My Loss Is Your Gain)
Reason For Sale: Never fitted them up, decided to change plans and bought a set of Smaller turbos to suit daily driver focused set up.
(My Selling History Speaks for itself.)
Contact: PM for Mobile Number.
Location: Sydney
Also have heaps more parts in my Signature.