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Resistance plugs have a longer duration spark (coupling of milliseconds) due to the effect they have on the inductive time constant. Balancing this is the much higher applied voltage to the plug which can double the gap on non resistance. Net results are effectively the same for the ignition event but could be significant in some applications/engine conditions.
Properly functioning non resistance plugs do not emit more RFI than resistance plugs except when they foul
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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