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I had the same problem yesterday just installed my gauge and i read and found out here that it is caused by boost pills in ur stock turbo and wastegate hoses being removed i had to install a manual boost controller and turn it up
Isn't that a band-aid fix over another issue? I had boosting problems with my old WRX and the thought crossed my mind about buying a boost controller and just turning it up. I was advised by a well known tuner that what I was considering was a band-aid fix and isn't usually recommended.