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You got that backwards. Mostly everyone is running low impedance. High impedance is the pencil type that allows the resistor box to be deleted.
Not running now, but if I need more than 1600ccs I will. The decision is mostly about idle quality. High impedance injectors see more current and can cycle quicker at low flow rates. This helps a lot since our ecms (stock) have very slow injector drivers. Most of the ethanol users are going to high impedance to help with the idle issues with E85 and huge injectors.
Is it a huge difference? Not really, FIC claims the 2000+ injectors have a nearly stock
idle quality, but it really comes down to the tune.
Other than that, high impedance means a resistor box delete, which cleans up the engine bay. If you put low impedance back in and forget the box, then you'll fry your injector drivers as the current is too much.
CAUTION! The internal construction of this 2150cc/min injector includes a seal that has been found to swell when in contact with MTBE from oxygenated fuels like Q16 or VP Import. This swelling causes a significant reduction in flow through the injector and therefore renders it unsuitable for use with MTBE oxygenated fuels.