23PSI

I have r33 Gtst - just had work done including - hi-flow turbo, timing belt, fuel pump, apexi pfc have intercooler, exhaust 3" etc. On cold start up, sounds like top end noise like a woop woop woop woop woop in quick sequence - difficult to explain but i thought maybe it was the new timing belt? It goes away when the engine is warmed up, any ideas?

GOt r33 gtst - Just got Hi-flow turbs - with power fc, fuel reg and walbro pump, intercooler, full exhaust etc - be prepared to do coil packs aswell you will run 10-11psi safely to answer your question - if you do nothing but be prepared to spend $$$'s on fuel cause your a/f is gonna go off the chart. Would recommend if you are going to do it without pfc etc to get a power run done on the dyno just to make sure you will be ok. bout $90 well spent if you ask me. Best bet is PFC, Fuel Pump, Fuel Reg and definately look at intercooler if not done already.