not to one side your thread but the swap is pretty much straight forward wheither USDM or JDM cuz i had the same question when doing my research on it. as for the ODB1 and ODB2 i honestly forget the differences but its a year thing. most people who have swaps though are 97 prelude engines some might have others depending on the year of their car. emission wise. the right gas in your car with some octane boost will lower your emissions like neva b4 so when inspection times comes around theres no need to even worry.