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Open Scroll EFR 7670 and done. I would not recommend the T51R due to lag. As much as I agree with the twins, the complexity and extra components make it a more indepth/complex project.
Grab a used Open Scroll manifold and a 7670 turbo. Lag will be minimal (similar to a twin T28 turbo setup on a RB26). No need for a wastegate or BOV either. Simple, effective and time to boost and response is not rivaled (Garretts turbine wheels are also fairly outdated. Precision, well I have no experience with, but would prefer the EFR regardless).
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