how much psi???

but i recommend simply blocking the vacuum line that goes between the ic piping and the wastegate and just letting it do what it wants :D
 
I dont believe in wastegate vaccum lines. Never ran one on my t25 and only ran it on my 28 like one event.
I fucks with it.

A stock headgasket will hold as much boost as a t28 can make.
 
I run mine at 0.8bar (12psi) its perfectly responsive I wouldn't go past 14psi myself although I have heard of people going past 16-18psi on stock headgasket; provided you have injectors and Mafs to match the S15 turbo (unless its an S14 turbo then of course you could run stock mafs and injectors but in this scenario i wouldn't go past stock actuator pressure.
 
If you're on stock injectors you're already pushing it past a safe limit. 12psi is it on stockers. You can take the turbo to 17psi if you have suitable injectors and a tune.
 
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