Question for the people with K24-7400 swaps

[Noisy Cricket]

Is the turbo ridiculously high-pitched compared to other units?

I thought I was hearing an electric air pump at first. Nope, that's the turbo spinning up. It sounds about an octave higher than the teeny tiny TD04 in my soon-to-be-ex-Volvo.

[Neacail]

Mine only gives a quick whistle when it spools, and then is more of just a whoosh.
It has an 11 blade billet wheel though, so YMMV

[Lucky]

I know when I installed mine I had a really large whistle too, never thought much about it until I installed my 11 blade billet wheel. That's when I saw that one of the old Wastegate mounting holes is straight through into the compressor discharge and not a blind hole lol my bad. I think it was a m6 bolt, just cut one to fit and not restrict the airflow.
Something to look into anyways.

[Noisy Cricket]

It works fine (actually this car is stupid for me, it just GOES and feels like a video game) but the turbo is almost completely inaudible except on cold start, when it spins up because of the high idle and I think Volvo is doing some really wonky things with cam timing and ignition retard because it gets the worst fuel economy I have ever seen when it is cold, and one of my other cars literally throws half of its fuel down the exhaust pipe unburnt at low speed.