Basically you want the same series injectors with the ecu you are using. 86' cars use low impedence injectors where as 88'+ use High impedence. If the car is an 86, you have a solenoid resistor pack behind the passenger headlight. You will need to rewire this resistor so you do not fry your s5 high imp injectors, or you just switch the injectors with some low imp ones 86' or 87' ones.