S5 High Im Injectors with 88 S4 NA harness
 

I picked up some s5 injectors and I have not been able to get a correct answer for this. I know that you can use low imp injectors with the resistor and they have a similar square plug when using the 88 harness, but I want to know if I can use the s5 injectors with the oval plug if I purchase the connectors and soler the wires in?

yes I have done so before

Both '88s and S5s use high impedence injectors stock, so the only thing to overcome is the plug shape.

Ok I gotcha, but let me ask one more question. I know i can use low imp injectors with the resistors, but can I use the S5 550s and then two SA 650s with the resistors?