The boost levels would depend on your setup; every setup would have different boost levels for the desired power level.
If your looking to 30 psi seriously in the future I would invest in a quality electronic boost controller that would display your boost at any level.
2004 SVT: bewst'd!
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2013 Escape SEL 2.0 Ecoboost 4WD
2004 F350 6.8L V10 4x4
1986 XR4Ti 2.3L Turbo, 15 psi