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increasing spark energy potential to the plug is helpful to a more efficient cylinder firing event but only to a point.
the way i see it, low resistance wires and hi output coils do not add efficiency, but rather they help prevent the loss of same.
if your spark plug can produce a sufficient arc with the existing factory designed equipment, then the upgrades to wiring or coil are not needed.
BUT, if you put higher strains on the spark plug's ability to arc that gap to the point of misfire, like increasing compression ratios, turbocharging or supercharging, altering fuel ratios, enlarging plug gaps THEN ignition wire and coil upgrades make sense.
Multiple Spark Discharge boxes are another thing... they do help improve low rpm cylinder firing and can help improve economy since they are in effect throwing numerous arcs.
The simplest way to upgrade your ignition system is to 1. increase spark plug gap, 2. use the thinnest wire electrode spark plug available. and 3. index your spark plugs if they are not centrally located in the cylinder.
IF your ignition cannot hold up to the increased demands now asked of it thru the increased gap, then look to fix the problem in the system that is breaking down first. Typically it's the spark plug wires first, the coil second, and the ignition design limitations third.
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