Next chance you get go to the track and see what guys/gals who race seriously are using..you'll probably find 8 out of 10 running Autolites..including the pro ranks:D:D
Is that because the other two out of ten use NGK and are already gone? :D
JK, as to me the actual brand doesn't matter near as much as the manufacturing quality.
Plugs that have cracked porcelain or bent straps right out of the box don't get second chance, and I have NEVER seen or had a running problem with NGK and that's why I just stick with them.
How could someone not think heat range makes a difference?
WTH?
That's the spec that REALLY matters even over brand or material.