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The Greatest
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If your thinking about forced induction, Its usually good to just upgrade the internals w/ your F.I.

Im not sure about the hp part but Stock internals can handle around 6 psi. So i guess it varies. I don't know how much hp you can get runnin 6 psi but if you want more power, you'll prolly run a higher psi. Which means you should upgrade internals.
 

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The Greatest
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Toysrme said:
You can't say an engine will take X amount of PSI. Every turbo is different. Thanks Tony ;)
That is quite true. But in most cases. You will be safe running 5-6 psi. But that is taking a gamble because of what you said. Every turbo is different.
 

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Grenaded piston
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