theres a tutorial on how to derestrict the boost its a piece of piss!
you literally take 1 hose off the solenoid and 1 end of the pipe back onto the hole you moved the other pipe off. literally a 1 minute job.
hopefully threw searching the site youll find a decent picture
And BANG goes your engine!!
Anything thats that simple isnt going to work, maybe look at a spare engine because your going to blow the one you have if your not careful.
Look into proven mods that are done time and time again- exhaust, air filter and an actuator. These mods should see you have about 120hp at the wheels which is decent for the money spent in my opinion.