Is the boost meter on dash can show max 1.2 bar?
I've change the VTG, exhaust, reflash and the max it shows 1.2bar from 3200rpm onward, but when stock it reduce to 0.9 bar at redline. After mods it keep 1.2 bar till redline.
What is the actual max boost pressure for modded VTG?

 

Boost pressure for most modified VTG turbos is determined by the programming in your ECU, rather than EBCs. A modified VTG turbo is programmed to run at specific boost levels if you have proper fuel and timing, or detuned to run lower boost pressures...it does not use a EBC to set those parameters. Your tuner should be able to tell you what your max boost pressure is set at.

 

what does your "tuner" tell about max boost?

make a search, this was discusses many times. Use the search button, then call your tuner and find all the answers.