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I've never seen the trim stamped on a housing of a genuine Garrett/Holset/KKK turbo. The Chinese stuff sometimes has the trim on there, but who knows if the wheels actually measure out correctly.
As far as how you'd tell - how else would you tell? You measure the minor and major diameter(i.e. the small and big diameters) of a wheel - plug into the above formula and you've got your wheel trim.
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