its the injectors them selves... they aren't the best for a honda ecu, due to their weird impedence, with or without a resistor box. thats really all there is to it
so like i said, it will work, but you will find the engine difficult to start, idle poorly, lean conditions for no aparent reason that you just can't tune out, not to mention trying to tune them in the first place- which will cost you money for time on the dyno. just pay 200 bucks more and get some RC's