I'm sorry Terry, but I said nothing about heat ranges. My main disagreement with your statement(s) is brand doesn't matter. It Does! Ask yourself this, Do you buy a product that lasts/performs for 6 months or one that lasts/performs for 12? Quality of the materials and manufacturing process will play a factor in any part whether its plugs, pistons, brake rotors, turbos, etc, etc...

I'm sorry, but when I go back to our returns department and see stacks of Accel & Autolite spark plugs all with defect tags on them and little to no NGK plugs on the return shelves that says something to me.
-Mark

You can do something for Love...
You can do something for Money...
But there is nothing quite so satisfying as doing something out of Spite.
GTExtreme1@aol.com