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The factory ignition is fine. The spark plug is only going to use as much voltage as it needs to jump the gap, no more no less. Say your factory ignition coil(s) are capable of producing 40,000 volts and while in boost (the time the air is most compressed thus providing the most resistance) you only need 30,000 volts, the spark plug is only going to use 30,000 volts even if you have 'better' coils that can produce 80,000 volts unluss you just want to have loads of reserve voltage.... If your looking for a longer spark you need to step the amperage up.
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