Also, do you run an intercooler? I have seen some rear turbo setups but no intercooler... But the turbos were mounted under the car so it cools the turbine / exhaust housing as you drive.
http://www.skylinesaustralia.com/forums/topic/318552-rb20det-engine-number-where-abouts-is-it-located/
RB20DET's came in the R31 / R32 Skylines / Laurels / Cefiros.
3 Piece = Nismo Side Skirts (Genuine) 2 Piece = Fake Nismo Side Skirts
1 Piece = Fake Nismo Side Skirts N1 GTR's don't come with body kits, customers just put Nismo body kits on them.