Running a map smallport in my ae86 right now, but going to put in a map ae92 4agze. Will the 4agze harness just plug and play or will I still need to modify it to fit everything? I'm like tom cruise in days of thunder, I'm just a driver, so I don't know these things If it's plug and play that's great otherwise I'm going to give tweakd a call.

Plug and Pray more like it . Personal experience tells me the non-ECU connectors wont match. Of course if you get an AE92 AGZE OEM ECU those will plug straight away. If you using the AGZE OEM ECU you'll also be missing the 22pin connector from the ecu that feeds power to it and controls Fuel Pump, Starter/Cranking input, engine check light etc. I ended up having to solder wires onto the ECU, and I was swapping an AE92 AGZE into an AE92 so i can only imagine into an 86 will be a bit more work! This page helped me a lot http://club4ag.com/tech-specs/4a-gze-ja ... -diagrams/ It all can be done though