[KitCarlsonEMS]

Not sure about the high resistance wiring. I see the grounding kits for ricers. I do not think they do much. The spark plugs ground at the block, the battery cable ground is at the block, not much lower resistance than that. My measurements suggest spark current is under 0.5A. On the coil primary side dwell time sufficient enough to fully charge the coil prior to fire is all that is necessary. Some ODBII systems have miss fire detection, and most monitor coil charge and adapt dwell for battery voltage and other factors. Some resistance is good for helping reduce EMI.

Increasing spark gap increases voltage requirement and energy. Too high a gap leads to failure of the ignition system components. Failures due to carbon tracking of high voltage components, and of semiconductor used to drive coil(s).