I never believed in that thought anyhow. Apparently these intercoolers do not require a tune and can be ran without. I have uninstalled the COBB Tune and tested and still having the same fault. Then I reinstalled and again and having the same fault.Just to put the shop's "a custom tune is needed" theory to rest, uninstall the COBB tune and reinstall the stock program. If the low boost pressure persists you should have your answer.