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saturated uses the same ammount of voltage to hold the injector open, while peak and hold uses the same ammount of voltage as saturated injectors to open, but once it's open, the computer stepps down the voltage level to "hold" the injector open. The advantage is that they run cooler. So saturated injectors have higher resistance values, which is why if you want to run DSM's or any other peak and hold injector, you need a resistor box to raise the resistance of the injector circuits so you don't burn out your computer.
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