i think ill buy a scraemer and a fcd just to ensure the safety of my engine
if you think that fitting just a screamer pipe and a fcd will ensure the safety of your engine then you couldnt be further from wrong... buy a screamer pipe if you want one but dont try fixing boost creep by just fitting a fcd
before you fit your screamer pipe install a boost gauge.
after fitting the screamer pipe keep a close eye on the boost gauge to see if the boost is rising unusually higher.
if it is then fix it by re-fitting standard air-box and filter or putting a restrictor (duck tape
) on your aftermarket filter if its what you have or some people port the waste gate of there turbo.
just remember to get as much info on what your gonna to do to your engine before you do it