r/Nissanqashqai

Hi all,
I need some advice here. I got a qashqai 1.5dci 2015 diesel car . Been hearing a hissing whistle sound on high rpms during my drive. If I be within less rpms , don't hear anything. It doesn't come on neutral (when the car is not moving).

Spent money for initial check and got to know that turbo needs changing. But I doubt, turbo needs replacing as I don't see any smoke and car runs fine without power loss. Anyone came across similar issue in your cars and how you fixed it . Thanks