Ah, I just re-read your original post, you want to inject compressed air into the exhaust manifold pre-turbine? That will be a bit of a problem, the turbine is driven by exhaust gasess, hot gases that are expanding driving the turbine. Adding compressed air to the exhaust gases will cool them down and will create less expansion, less drive pressure. You might even add more lag.
Injecting a large volume of air into the intake would be better.
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