Probably best to borrow a good boost gauge and take a mate for a spin to see what your maximum boost is. The stock gauge is often innaccurate. The stock gauge has +7 mmmg(?) which is 14psi or 1 bar I think. Stock boost is 9.5psi and a couple less when tripped into the safety map. I could be wrong but hopefully its more useful than the previous posts .
purchase a boost gauge, install said boost gauge, start engine, get into car, put your seatbelt on, drive car , mash throttle pedal to the floor in 2nd or 3rd adn read boost gauge. record max reading.
Lol, you said 40 last time and said you were adding one everytime someone asked, are you seriously counting?