here's a little info for you...
Jap PS13 14411-50F00
AU/NZ S14 (pre-facelift) 14411-75F00
AU/NZ S14 (facelift) 14411-75F00
Jap S14 (pre-facelift) 14411-69F00
Jap S14 (facelift) 14411-82F01
Jap S14 (Autech/270R) 14411-RP801 (Same as S15 early MT turbo)
Jap/ NZ S15 (early*) 14411-91F00 Manual model only
Jap/ NZ S15 (early*) 14411-69F00 Automatic models
Jap/ NZ/ AU S15 late* 14411-75F00 Same as NZ S14 and same for both Auto and manual
and also this (regarding BB or not)
So auspec S14/15 = None BB T28.
JDM = of course.
The first number is a batch number, it tells you when/where it was built
The second number is the "oem" number. On a nissan turbo it's a nissan part number, on an HKS turbo it's an HKS part number, on a garret turbo it's a garret number, on a Tomei turbo it's a tomei number etc etc. 14411-69F00 is a nissan part number.
The last number is a chra number. 466541 is a ball bearing cart with a 60 trim 60mm comp wheel and a 62 trim 53.8 mm turbine wheel, 466543 is a brush bearing cart with the same wheels. On this particular turbo the second part of that number describes what turbine housing is used. If it ends in 01 it means the "normal" turbine housing, if it ends in 02 it means the S15 turbine housing with the splitter between the turbine and wastegate exit.
thnx to
What's the difference between S14 and S15 SR Turbos? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum
also some info here :
T28 Ball Bearing And Non Ball Bearing Turbo - SilviaWA Forums