Hello from 944 Turbo World -- I was thinking you all might have more experience with this issue so thought I'd drop in. I have an 044 pump on my 500hp 944 turbo motor, and it's been reasonably quiet for years. Today I had to replace my 3 bar fuel pressure regulator with a 2.5bar version and the pump is now buzzing/screaming like crazy. I can hear it on the highway. I'll try swapping the regular back to the 3bar to see if that quiets it down again, but am curious if this is a known-thing, or if anyone had insights on this....?