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HKS GT2530 uses an older style 63 trim T28 compressor wheel. Our turbos have the newer 62 trim GT30 compressor wheel. Max flow is roughly the same, but GT30 wheel has better efficiency. HKS has their own .6 A/R T04B housing cast to fit 300zx application, we use an off the shelf Garrett .6 A/R T04B housing, but modify it to work in 300zx application.Turbine wheels and housings are identical.
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