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These injectors are, High Impedence which means you wont need to use a resistor box with them. If your vehicle has a restrictor box on it, you will not use it with these injectors, and it can be removed. If your car came with side feed injectors from the factory you will need a top feed conversion rail to run these injectors as they are top feed only. Injector Dynamics, the founders of "Dynamic Characterization" batch test a large number of injectors to carefully match them into sets based on their dynamic flow across the pulse width range. This offers superior cylinder consistency which results in a smoother, better running engine that is easier to tune, and more daily-driver-friendly.