BluePrint GM Style Engines
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      Are the Multiport Fuel Injection (MPFI) engine's ECU unlocked for further tuning?

      No, the ECM is locked and should not need need further tuning.

      This EFI system does not need any modifications to the ECM and is ready to run 
      with the tune that is installed from BluePrint Engines. Ignition timing is also already set in the ECM to give the optimal performance.