Currently my car has napa premium 7mm wires. Would i be able to tell a difference if i upgraded to 10.5mm wires? I know it smooths the idle or something but is there any performance gains?

 

my bad wrong word usage, i meant to say Plug wires which is the best kind?

 

No You wont notice a thing unless your old wires are really old. You will get better performance and spark, but your butt dyno wont notice the difference. If you had a full exhaust, bigger carb, ignition upgrades, then yes, I would say that the wires would make a noticable difference.

 

been running the magnecors for about a year now...those things are thick bastards 10.5..been very happy with them

 

ngk all the way......