So, just yesterday evening on my home from work I was hearing what sounded like the bypass/diverter valve open and close rapidly with chirping sounds while at peak boost. Almost like it cannot hold the pressure I guess. I am running the Mountune MR230 setup and according to the access port and what I can hear it appears that the issue starts when the pressure reaches about 24psi. I went ahead and bought a new stock diverter from Woosh and am planning to probably also buy the GFB DV+ kit to hopefully prevent this in the future... I am just curious if anyone else has experienced this on their ST and how they resolved it.
