It was on one of the few dozen random web sites that I was reading when researching all of this. But I was wrong - and went straight to the source just now - from Garrett. GT2554R = 42mm inducer and 54mm exducer https://www.garrettmotion.com/racing-and-performance/performance-catalog/turbo/gt2554r/ GT2560R = 46mm inducer and 60mm exducer https://www.garrettmotion.com/racing-and-performance/performance-catalog/turbo/gt2560r/ So 4mm larger inducer and 6mm larger on the exducer. That's about 1/4" which I guess is a lot on a turbo wheel?
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