Do you mean the dyna S ignition? If so then technically, no, you do not need resistor caps or plugs. I would not use resistor plugs anyways. The caps are meant to reduce rf interferance or signal noise. Remember hooking up a radio in a car and getting tremendous noise when the engine was on? Same thing.
If you run no electronics on your bike(solid state regulator does not count), then you can run no resistor caps. Unless of course you feel sorry for that cager maybe getting noise on their cell while next to you!
Now if you got a dyna 2000, then yes you would probably want resistor caps.
The ride IS the adventure. The destination is just to get gas!