Bug eye WRX Max safe boost ?
 

Hi there ,
Does anyone know the max safe boost that can be run on a my 01 bug eye wrx uk with the only engine mods at present being a boost valve , dump valve , cold air intake and a FCD thats yet to be fitted .
Running at 17 psi at present , was at 15psi on oem valve , when on 19 fuel cut occurs . Guy on trade stand in max live reckons standard wrx will run 18 / 19 psi on standard engine with no probs , is this right ?
Also if i do a front pipe decat will it still get through mot emissions test and will it gain any more BHP!!?
Cheers
:)