I have a 2015 CS. I see normally about 18 to 19psi in the lower gears when hitting the gas hard. Even in non sport mode. My issue is having anything above 10-12psi at higher gears. Doing some research, and having a few dealer fixes- I got the update for a less sensitive knock sensor, so it allows for the higher boost. I was losing boost going up hills in the past in higher gears. I also suspect some TC issues, but the dealer claims it’s ok so far, but I’ve had some hard shifts, phantom ‘bumps’ while stopped. Another item for more boost- is the diverter valve. This is like a recirculated bov, and if it’s having probs, you can lose boost. The stock one is plastic, the older turbo cars/Cayenne’s sometimes replace them for stock or aftermarket so boost doesn’t leak.

I tried a pretty hard launch in manual mode and was surprised to see 17psi (and possibly 18?) up through a few gears (2nd through 5th?). Ran out of road.

Seems it pulls harder on a full power launch (and with your foot through that detent in the last inch of travel) vs leaning on it at highway speeds.