So did you get those plugs put in or not?
You're going to be thinking "he's right, you really do feel a difference".
And you'll know what the "burn" is that I've always talked about... once you step on the pedal, you'll just feel the engine "burning" fuel.
Say for example..
Stock plugs or non Denso Iridium-When you step on the pedal halfway... you feel a a burn... but if you step past the halfway, there's no more burn... it's like a sort of lag, like you dont feel any thing else different from the halfway point, you don't feel like it's doing more..
Denso Iridiums-press to the halfway point..you feel a burn... press all the way down, you just feel the engine burning and keep burning...
You'll know what I'm talking about when you get it put in.