I was looking into getting the AEM EMS this week and I was fooling around with my ECU and I noticed that whenever i swapped my JDM 96' Spec R motor into my 96' GSR a year or so ago...That the type R ECU P73 has 4 slots for plugs and the GS-R only has 3 plugs and I have an open port in my ECU. Now...the car has run fine no problems. I have headers and intake and straight pipe through exhaust...no cat, and I dyno-ed @181 whp. Is this normal? Could something not be going right because of that missing plug in the port? Or should I look into getting a conversion harness?? All help on this subject would be greatful. Thanks.

Jon