| Factory ratings are conservative. You need to look at the compressor maps for max flow. From the compressor maps, GT3071 flows about the same as GT3037. But you'd expect the bigger 3037 to make more hp more efficiently. I'm sure 3071 has a more efficient turbine wheel than the older 3037. But either way, it's going to be pain to fit them in there if you have seen how tightly my TD06s fit. Even if you get one with a 2.5" inlet, you still have a To4E sized compressor housing which is a little bigger than my TD06 housing.
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