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Except that 2nd link is incorrect about the turbo size.
The Nsport and XS engineering kits both come with T4 turbos with on-center turbine housings. These fit better on the Revhard manifolds than T3s do (since all T3 turbine housings are tangential). T3s don't fit without hitting the brake MC on many cars with that manifold.
If you aren't using that manifold, and will be able to fit a T3/T4, use a (turbonetics) stage III wheel in a .63 A/R turbine housing, with a 50 trim compressor in a .50 A/R wheel. That is perfect for most people in terms of lag, and efficiency for most people's power levels.
Dennis
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