No crazy RPMs, has no mods so doubt there is any KR. The car feels the same, in other words getting full boost. Does anyone know what the gauge is hooked up to (I know the supercharger), because I have a feeling it's just getting a false reading.
Check the connections to the MAP sensor. It's located above the rear valve cover. Has one electrical connector, and a vaccum line leading into it. Also check the vac line, since it connects to the SC, FPR, and boost bypass.