I am doing this right now-dropping in the jap spec 2j injectors(440's) They will defintily fit in without issue, will have to see how the car adjusts to them. They are the right impedence(high) as the 1j ones. The us spec 550's from the 2j will also drop right in the rail and plug in, but are low impedence injectors and you will have to wire in a resistor to get these to work. The stock ma70 resistor should work fine here.