What is the ecu that goes with the jdm d15 vtec, 5 speed engine?Yes and no, regardless of OBD you can make it work. The fuels maps for both engines will be different, but the first gen d15b will do fine; it'll run much like a z6. However, the OBD2 JDM d15b will not work right if; it will need a second vtec switch for 12 valve mode. You won't see the full 55 mpg benefit from 12 valve mode because fuel maps are different, but you can make it work.