I have searched on this topic extensively but all I can find about OBD1-->OBD2 is stuff about selling the jumper harnesses or putting newer motor in older chassis. I have the exact opposite problem...I want to convert to OBD2 so I can pass emissions testing. Currently I have a 1995 JDM H22A in my 4th gen Accord. I bought an EK a few months ago and I want to move the motor over...however my only options are to find someplace outside of the 'emissions testing region' to register my car or actually make it legal. I am somewhat confused though. I plan on going further than just putting the motor in the car (read that as turbo) so I eventually will be running the AEM EMS. I know that wont pass emissions but as long as I had the car correctly wired I could always plop in an OBD2 ecu when testing came up right? As long as I have the OBD2 version of the EMS everything seems as if it would be ok. Basically I just need to know which sensors need added/changed to be able to use the ODB2 ECU and not fail. I am aware of the sensor in the gas tank, the secondary 02, the distributor...but past that I am stuck. Also, would an OBD2 GSR ECU be able to pass the emissions testing with the H22A? I know it would not be an optimal choice, but again I am planning on running the AEM EMS so I don't really want to buy the very expensive OBD2 H22A4 ecu (w/o immobilzer) if I don't have to (but I will if it comes down to it). Is this even possible? Should I just sell my H22A and get an OBD2 motor to begin with? Thanks in advance.