Guys:

Saw this today: NGK Wires 58403 for a DI

NGK PREMIUM WIRE Spark Plugs-Denso Spark Plugs-Champion Spark Plugs-Bosch Spark Plugs-Autolite Spark Plugs

Denso O2 sensors do not know which is Pre-Ael
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How many mm? I've had good luck with the 8mm Kingsbourne.

 

I bought the NGK's off of Amazon in a similar price, Pretty sure they are 8mm but they talk more about the construction than they do the size.

 

i have the same ngk's and as far as i can tell they're great. i remember them being 8 but now i don't know. i also remember people saying that the 8mm is reflective of the protection and not the wire. now i dunno.

 

I just went down and read the box and they do not state the specific thickness but do describe all the other attributes that supposely give it premium performance, low resistance, and some other supposedly superior
design aspects.

I did however have one end pull off when a NGK Spark Plug lodged in the silicone boot. They do have a lifetime guarantee and I have the damaged one in a baggie, just need to pursue replacement I guess.

For the price I cannot complain as they are less than half of the Magnecors. Only time will tell, but so far they are performing well with the exception of the one above.