More updates! I've done Willow Springs (WSIR) and Streets of Willow (SOW) with this mod. I peak at 20psi and taper off at 15psi on my VF52. I logged 80miles of racing at SOW and 120miles at WSIR. This thing held up like a champ and I suffered no heatsoak issues since you're constantly moving at the track. This thing serves its purpose as being a cheap alternative to an aftermarket TMIC that doesn't spit at boost levels greater than 18psi and also overachieves by being able to handle the long duration, multiple cycles of repeated boost.
For those contemplating this mod, do so in confidence.