Originally Posted by AttackHelicopter
I’m simply putting in a superior set of spark plugs. That’s it. I replaced the BRAND NEW spark plugs in my mustang when I got that car (less than 2000 miles them probably) and it made a world of difference in how it idled and ran as a whole. So, I’m attempting to get the same results here, with the same plugs in a different car.
: you won't see any increase in performance by changing to a different spark plug from what's in your Hemi now.
: the dual spark plugs per combustion chamber on the Hemi's effectively reduces the spark plugs' electrode material to being relevant for longevity only. So no matter if you run the standard copper core, platinum, double platinum, or iridium plugs, it is unlikely that changing to a different type of plug will yield any benefit as far as the individual combustion events are concerned.
There is some difference between brands possibly, but even then, I think most everyone agrees that NGK is the top of the line...and you already have those.
If you were able to get some extra oomph from a different set of plugs in the new-ish Mustang's engine, that could theoretically be attributed to the difference in (quality of) the spark plugs' brand and/or center electrode material I guess. However, that difference is negated with the dual plug setup in the Hemi I'm thinking.
2 of a lesser plug will equal what 1 of a better plug can do when it comes to exploding air/fuel mixtures.