Z1’s 525+ posted by Mike@ZSpeed on March 04, 2023 at 06:34 AM
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"Uses stock compressor and turbine housings which are precision CNC machined to house the larger compressor and turbine wheels." So yeah originally it is a Garrett turbo.
I don't have any first hand experience with Z1s turbos so I have no idea. In my past experience Id lean 100% towards a turbo built by JWT... sport 700... 550... etc.