Question on fuel injectors...

I know our cars use high impedance "saturation" injectors, correct? What would it take to use low-impedance peak-and-hold type injectors without frying the ECU? Is it a simple matter of a series resistance added to the injector circuit or is a more complex load needed (ie do there need to be any caps or inductors in the circuit)? Does anyone know what it takes to get this to work right? If it's just a matter of throwing some resistors in line I can just get some close-tolerance resistors from my local electronics supply, but I don't want to waste my time if I need to do more than that.

Thanks in advance