Please let me shed some light on the injector subject also, or should I say, let me turn on the lights for you. Injectors do in fact come with different internal resistance. (Impedance). High resistance, called "Saturated", and low resistance, called "Peak and Hold", are the two types commonly used today. At this time, - 90% - of all automobiles, including the Japanese, are using Saturated - 12 to 16 Ohm Injectors......

Peak and hold injectors are fired at 4 to 6 Amps, through a ballast resistor, and then fold back to 1 - 2 Amps for the duration of the injection event. They are also known as "fold back" Injectors. Peak and hold injectors are faster responding than Saturated injectors by as much as 1 to 1.5 Ms. They are activated with more power at opening than the saturated types (4-6 Amps vs. .75 -1 Amp.). Peak and hold injectors will maintain injection delivery, cycle to cycle, continuity more accurately than the saturated type. This is particularly true and even more important in high-pressure (75 - 100+ PSI) systems. The higher Hydrostatic loading at excitation requires more amperage to initially activate the injector solenoid and properly maintain complete opening. Peak and hold systems are more expensive to manufacture because they require one computer "injector driver" per injector in most applications. This is a design requirement in Sequential Fire Systems where each injector is fired at a very precise, pre determined, time in the 720 degree 4 stroke processes. P&H injectors are also wound with copper wire instead of brass wire. ....

Saturated injectors are used in almost all-standard production, 1998, engines because of the system cost and simplicity.