My car is making this sound ???
#13
9 Second Club
#17
#19
If you're making 2psi then your wastegate line is NOT collapsing. It will have pressure in it at that point. Have you checked your wastegate/s for binding? I had a wastegate that would stick open intermittently and keep my boost around 2-3psi. I lubed the shaft with anti seize and it fixed the problem.