wwmjg
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You can run either - both are capable of 50 psi if you dead-head them. In the case of the SPFI pump it's regulated down to 21 psi at the injector. In the case of the turbo it's like 35 psi..... you won't get any benefit from running the turbo pump - it doesn't change anything. The SPFI regulator will still drop the pressure to 21.
GD
