So it's raining pretty hard in SC and I'm playing the slinky game in traffic when it slowed down to about 45mph/~2k rpm in 5th. There was nobody behind me, so instead of downshifting when everybody got going again I just rode 5th (peddle floored) back up to 60mph. As it was accelerating, I noticed the boost went to 20psi. Curious, I tried it a few more times, in 4th and 5th, both starting at around 2k rpm. Same thing. After about 4k rpm, when it feels stronger, the pressure drops down to 16psi and stays. This never happens when the car is in a normal power band and wot.