Most cars have "magnetic suppression" type spark plug wire these days. It is a long coil of thin wire wrapped around insulating fibers. It acts as an inductor in the circuit. This tends to make the current much more constant during each spark.

I went with MSD plug wires that are Magnetic Suppression type.  My thinking is the using induction vs reistance for current limiting is better because the energy is “stored” rather than “dissipated” as it is in a resistance.  But I don’t know if the “R” plug is really resistive, or also is primarily using induction. I think I recall MSD says suppression plugs are not needed with their wires.

        If the coils and ignition control module you have selected were designed to use magnetic suppression wires and resistor plugs, you would probably be smart in continuing to use these type plugs and wires. The higher peak current from non-resistor plugs can also damage the coil or ICM if they are not designed for that use.

Good point.  I’m sure that the LS1 coils are designed to use some kind of suppression.  I know that the earlier electronic ignitions set up for carbon core wires would not work well with regular wire.

Al