N55 Pressure Converter

[quicksilver3121]

Has anyone replaced one of these on an N55?

https://parts.bmwofsouthatlanta.com/...747626351.html

I'm thinking I might need to get mine replaced. I can hear a metal flutter under partial to medium acceleration which seems to stop if I increase throttle. It's tough to hear but typically it's clearer if it's getting reflected back at me. My wife was in the car with me this evening and could hear it too. It's very faint though, we need to turn off the radio and really listen... I'm sure it would be clearer to someone outside of the car if I drove by.

I'm guessing it's the wastegate fluttering under low-medium load.

No codes or anything that I'm aware of, car seems to perform fine too.

Figure I'd give this a shot before worrying about having to replace the whole turbo due to a wastegate issue... Don't want to spend all that $$$ too if it's just to stop a noise.