my r33 gtst is boost cutting or leaking, i'm not quite sure which one it could be but basically whenever i boost more than 5 psi, boost just wont hold, it either spikes at high rpm's or i don't feel the boost at all. For example the other day i set the boost to about 9 psi and at full throttle it spikes a little (not much) to 4/5k rpm and past that it will just start cutting like it doesn't wanna go any further. So now it's set back to 5 psi but i need to get rid of this problem. I've been told so many different things like Coilpacks need to be changed, intercooler could be leaking cos a friend installed it not a mechanic, BOV could be leaking etc.