Heres the tested complete FR 9mm Spark plugs test vs. Magnacore 8.5mm
With 1ohm current the Ford Racing 9mm made a staggering 1.27volts(or ohms cant remember) the Magnacore made a 4.12v(ohm?).
Translation, 4-5 is good but 1.27 is astounding, great upgrade for the amount of insulation and for the resistance.
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