You can get em locally from HKS distributors like BD4's in Sydney but buying from nengun etc is cheaper.
Sure is.
All I've got is:
No AFMS
720cc injectors
nismo fuel pump
R33 N1 turbs
trust tuned length front pipe (got rid of it) uas front pipe now
hks hi power exhaust
Cam gear ex side
Got power figure running Jap tune (lean) and 17-18psi
Then I got it tuned to run on 98 and lost 20kw.(276RWKW)
Now I need more tuning done to aim for 300RWKW at 1.3bar, 18psi, cos it's running hell rich and only making 266RWKW on dyno at 16psi, with A/F going to 6.1 at some points!
This is due to changing shagged N1s for good cond 33 N1s with stock GTR rear turbine housings(more response).