this was 3 weeks ago, but make sure that the air flows towards the turbo and none can make it back to the AFM ,, ie if it comes in at a T connection air goes both ways and will make the AFM measure airflow and dump fuel into the engine..
there are some nicer looking ones here in AUS, but not that cheap
they are AUS$1150 though
as found on www.nismo.com.au
i have one on my rb25det R33 .. uses std length runners which will help with torque that the rb20 usually lacks
The factory serial numbers (genuine nissan) for the oxygen sensors:
R32: Front - 22690-05U21 (Flat 3 wire plug)
Rear - 22690-05U22 (Square 4 pin plug)
not cheap in AUS thats for sure
would suggest definately taking the oil pan off the motor so that there is no chance of fusing the oil pickup to the pan itself..
i have seen it happen..