blitz super sound blow off valve

hi, i was looking at the above item in a website.
It say it will hold upto 1.2bar. I am running my wrx remaped to 1.35bar. does that mean its not suitable for my car? or does this mean something else?!
Any info is appreciated.
thanks in advance,
mike

ps. i know alot of u guys dont recommend fitting a bov and probably say to me dont bother!!!.... I still want one cuz of the sound it makes!!!hehehe

 

get the uprated "hard" spring as this is recomended for 1.2 bar and above

 

cheers for the info.
Do you mean the unit comes standard for upto 1.2bar and so i need to add on uprated harder spring?!

 

anyone got english instructions for fitting one to a MY00 impreza