i'm not familier with b18a1s but i'm pretty sure the obd0 an obd1 have the same engine code right? if so whats the difference just the wirering harness an ecu or what? if not then how can u tell cause i found a b18a1 that i want to swap into my 90 hatch i would like to keep it all just obd0 cause its easier but don't know the difference can someone help me please