I wonder If Hondata would have an answer on this one? :mwink:
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It will run the car, but not as well as a PRB ECU. The fuel pump will not work without rewiring. Realize that the PRC is missing output circuitry that is needed to run nitrous if you upgrade to K-Pro.
I met a guy once who had a K20A2 swapped into an EM2 civic and was using a K20A ecu. It ran, but he had problems with bad hesitation about half way through the rev range. From the passenger seat it didn't feel like it was running very well to me, but I think he had some other issues as well.
Just wondering if you can get a K20A2 ECU and just get it reflashed? might be safer then trying to rewire stuff. I dont konw your curent situation, just a heads up.