Fuel Injector

Im looking to get injectors that is 500cc+ for my RB20DET …
If somebody can clairify on the whole resistor box use, Im trying to choose between RC Engineering & Deatschwerks.
Peak and Hold-Low resistance & Saturated-High resistance are the options ? Im pretty sure that the oem injectors are peak & hold, so do both resistances require the use of the resistor box ? Or does it depend on the amount of cc’s ?

For example; if I was to go with 550cc Peak & Hold injectors … Will I need a resistor box ?

there are low impedence and high impedence injectors. (top feed /side feed)

low impedence injectors need a resistor pack.

rb20’s come with high impedence injectors.

if you wanna upgrade then either look for 500cc high impediance injectors … or 500cc low impediance injectors with a resistor pack.