Parts for car

what is the best mm of spark plug wires? 8 or 9?

i have a 99 v6 mustang and im replacing the spark plugs and wires.
which spark plug wires are the best ones? 9mm or 8mm?

if it matters, im putting NKG irridium ix spark plugs in.


9 MM is better.

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NGK HYPER SILICONE POWER CABLE Spark plug wire test = LOW RESISTANCE

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