dont know if its relevant, but Ive only had the car a few month, and it had a brand new turbo fitted not long B4 I bought it.

I thinks its a standard garrett T3 turbo

Car has race clutch, stage 3 head, piper cam, bleed valve, chipped, running 15/16psi, pace double capacity intercooler.

runs fine 90% of time, but sometimes when you floor it a bit, you get to say 3rd gear and it boosts so far and wont go no more, holds there, or seems to missfire a bit????

(ive bought a collins -31 atuator and will fit that and remove bleed valve, just havent got round to it yet, as boost problem has been suggested as weak actuator???