Originally Posted by JrMechanic
I call BS on any claim like that. While it's a possibility that they may increase power, whatever increase that is will be marginal and the other variables involved (ambient air temperature, who's doing the dyno pull, etc) will overcome it, so it's impossible to say they provide more power and better mileage.
They took painstaking effort in making sure the conditions were the same for each dyno run. At least they made the effort to dyno. Saying E3 plugs are better is no more stupid than putting a 3" exhaust on a stock 5.2 and saying it has more power from your seat of the pants feeling.