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There's no "stock boost level." It's a torque based system. Basically, the computer will command only as much boost as needed to hit 148ft/lbs of torque. So if it's cold out (denser air) and your engine is making plenty of power, it may only use 8-10psi to meet the torque target. If you're at high elevation or it's really hot out, it'll make 16-18psi of boost. However much it takes to make the torque target.


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The above statement is true. The folks who are stock with boost gauges seem to say around 12-16psi they're hitting.
 

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Talking average boost or peak boost? Intake manifold is nothing like static PSI, Shop manual states a maximum peak of 35 psi, most gauges read average.

But boost is only one parameter, key is SAE HP at the engine shaft, valve timing, ignition timing AF ratio, compression, displacement all play a factor.
 
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