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i know a BNR stage 3 uses a 60-1 hifi wheel which is 59/76mm (2.3/3"), with .60 A/R cover
the stage 4 is basically the same except the turbine is modified for a P-trim turbine wheel, which is clipped to prevent boost creep i believe. the p-trim is 2.544/2.922"
not sure about stages 1,2
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