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:GT28R uses 60 trim 60mm compressor, GT28RS uses 62 trim 60mm compressor. They use different turbine wheels, turbine housings, compressor housings. I was looking at that online, but I've noticed that even with the same turbo, you can get a few different configurations with different wheels, trims, etc. So if it's a GT-22, you can still have different turbine wheels, housings. etc. But it doesn't change its designation to something else, it remains a GT-22 turbine.
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