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OP also mentioned in another thread that it he saw the boost was being limited "I also ran some highway pulls and boost seems to be limited to 6-7PSI in 1st and 2nd gear, 3rd gear goes up to 15psi, which seems more normal. Just wondering what could have caused this as mods were installed by a PO and not me."
And I suggested "Are you sure you have a GIAC tune installed on the car? Boost limiting by gear is a pretty common setting using a JB4, not saying you have a JB4, just that what you describe is a common and easily achievable modification by the JB4."
I understand now they confirmed there's a GIAC tune on the car, my theory about a possible JB4 may still be relevant though due to the boost by gear settings.
OP, try pressing the down button on both steering wheel buttons at the same time (minus volume and down arrow), if the guages do anything then that'll confirm there's a JB4 in there.
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