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In the FD's the most popular ecu to run is the pfc which only supports high impedance injectors. The options we use around this are either resistors, or the FJO injector driver box, this converts the signal to use the injectors as they were designed as peak and hold. More fuel is available by using the injectors as peak and hold. The bosch 1680's are 5.1 ohm which just barely exceeds the pfc injector driver circuits, many people get away with no resistors, or as low as a 1 ohm resistor is considered within the driver's limits. I personally use 4 ohm resistors because that's what came with my injectors.
The pfc can also be used on 2nd gen rx7s by using an adapter harness. You can't run larger injectors on the stock computer without it running like crap, and you can't change the impedance of the injectors or it will run like crap and you risk burning up the injector drivers. You need a standalone computer and then you can mix and match and tune it out.
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