The stock injectors can only provide some much fuel. Some people have been able to do higher boost. But that was under certain conditions. For example using race fuel, cool ambiant air, and luck. Also when trying to mee airflow needs at higher boost lvls you are running a higher duty cycle on the injector itself. Anything over 85% duty cycle on injector is risky.
Now if yoou want to buy an MDM-100 and go dyno at higher boost lvls you can find out for sure how much fuel you have available.