I'm at 670+rwhp on 8.5psi. The boost isn't what you need to be worried about. Total power made is what breaks things. A safe tune, and someone behind the wheel that's not a ham handed mullet, will make things last a while longer. If the operator is bound and determinded to break things, he needs to leave it stock. As mentioned above, you shouldn't mod things if you can't afford to fix it when it breaks. If you're looking for absolutes, leave the car alone.
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