You are tuned for this correct? Cobb AP? Open Source?
I am sure you already know this but just in case.... ANYTHING that changes air flow (turbo, turbo inlet, intercooler, intake manifold, etc), exhaust flow (headers, up-pipe, down pipe, etc) or Fueling into motor (Injectors, Aftermarket FPR, etc) then you need to update your tune. With the mods you have this needs to be Protuned.
When you go to a aftermarket intake (pre-turbo) the volume changes form what the car thinks, Your headers changes the flow to the turbo which changes the spooling characteristics, the downpipe allows for less back pressure and better flow again changing the spooling characteristics, Injectors flow more at the same pulse as the stockers, That turbo is larger than what was there, the intercooler has better cooling eff...
OH and did you remove the restrictor pill? Are you trying to run a manual boost controller? Or stock boost controller?
I am hoping your reply is that you have some sort of protune for all of this... if you don't stop driving your car and do so... get an E-Tune at the very least!
05 WRX Wagon - 409 AWHP / 334 WTQ Wicked Matt Tuned