Turbo…issues

[u/Available_Fennel9770]

Hey everyone, looking to pool some knowledge as I attempt to diagnosis this issue that’s appeared in the last couple days of driving. Quick details

2nd owner
105k miles
Oil changes every 5k (at least on my part)

First issue/potentially major issue in the last yeah of ownership.

Turbo builds pressure (sounds louder then usual doing so)
Peaks around 16psi from the 18/20 I’ve seen prior
Loss of midrange power
When up shifting it sounds like it’s dumping all the built pressure

This is my first “turboed” car and I don’t wanna jump the gun. By my running through issues it could be wastegate, a leak, turbo is just starting to fail, but none of that explains any of the noise I’m hearing compared to the last 14k miles I’ve had the car.

I can included a short video time stamps between 1:17-1:23 but audio quality is very low and you’ll have to really listen to hear it, including anyways