Unfortunately I did not have a way to datalog before I had the flash done, but with Stage 2 it looks like it's closer to 14psi. Since there is no physical boost gauge with the P3 product, your gauge should be displaying the same info as the Bavarian Technic tool that I used here.
Try a 3rd gear pull at WOT from ~3k RPM to near redline and see what the gauge peaks out at.
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