Err not quite sure where you got making 240hp at but this guys setup:

have a boosted stock 4age ive been driving now 6o miles a day at 8 psi, heres my set-upt3 garett turbo for z31
ss autochrome manifold ( not cracked whatsoever )
custom 2.25 neck to 2.5 downpipe and open exhaust
7mge 315 cc injectors
adjustable FPR 5psi over stock
OBX FMU 12:1
still tock fuel pump ( putting on walbro 255lph soon when it gets warmer here in NY
custom intercooler and piping
dsm 1g bov recirculated to turbo inlet after AFM( more efficient and driveability )
8 lbs lightweight flywheel
act 4puck sprung ceramic clutch
manual boost controller
ARP headbolts
1mm cometic metal head gasket
fun to drive , although i dont know how much HP im making , i hope at least 170HP ill be happy.



Only pushing 170hp. And like i said i strongly reccomend getting cams if your wanting over 180-200hp