All Injector Dynamics injectors are high impedance.  If your car came with a low impedance injector and a resistor 'box', it will need to be bypassed. 

The wiring at the resistor box should have 1 more wire than the number of cylinders, 5 for a 4 cylinder, 7 for a 6 cylinder, etc.  One wire is power going into the resistor, the rest are power wires out of the resistor to each injector. 

To bypass the resistor what you need to do is connect all of the wires together that were going to the resistor.  This will send full 12 volts to all of the injectors.