Shadowmixer

Hi, I think I am in trouble, I just purchased an 2004 EVO from Michigan , the car just installed Link G4+, I still have the box with me. However, now I got stocked , because according the CA smog regulation, I will need the OEM ECU in the car, but I don't have it. I don't know if there is a way to simulate Link G4+ , so when they do the OBD2 scan or monitoring, they will still think the car has the stock ECU. Please help me , thanks