Besides the price.. what sorta difference is there between an 8mm and an 8.5mm ignition wire...

The reason I ask is because I'm lookin at the magnecor wires, and want to know if it's worth it to buy the 8.5mm wires over the 8mm wires (which are already a whopping 1mm bigger than the stocks)
Thanks for the help
One advantage of the denso iridium plugs is that they take less voltage to fire a spark, so a smaller cable is sufficient. I plan on getting the 8mm for my 12v with denso IK 20 plugs.
Thanks for the input



