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Surely we have to consider somethings about eletromagnetic field created on some wires that could interfer on eletronics stuff like EFI.

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Run some solid cores and turn on the radio...

I just run quality spiral cores and have never had problems. Unless you're racing I doubt you could tell the difference between 500 ohms/ft and 50 ohms/ft wires. The difference in voltage drop across the wire compared to the spark gasp is very small. If you run the old carbon core wires at 10,000 ohms you can feel the difference.