GT28RS is GT2860 not GT2871. GT28R is GT2560.The R denotes hybrid. The 60 is GT30 compressor wheel with 60mm exducer and 47mm inducer. The difference in output is not because of the compressor housing. The housing affects spool-up time, but not the output. The output difference comes from the turbines. GT28R is GT2560 and uses a GT25 turbine(42mm exducer, 53mm inducer), flows about 14.5LB/min max at 65% max efficiency. GT28RS(GT2860) uses a GT28 turbine (47mm exducer, 54mm inducer), flows about 21LB/min max at 72% max efficiency. That's where the power difference comes from.
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