When the product advertisement starts talking about voltage and watts in the same literature. It's usually a good indication it's BS.
What they are doing is throwing up all these terms most people don't really understand and making you think these plug does magic. Here's the thing new cars use coil on plug to generate the approximately 20,000 volts needed to cause ionic break down of the fuel air mixture. If you go and read this:
http://www.sentex.net/~mwandel/cannon/sparky.html
You can see they have a diagram of the typical arrangement in a modern ignition coil. Notice that there's no direct current path between the power source (battery) and the plug (because the coil between the + and - acts basically as a short circuit and current will always flow that path, unless you invented something for the spark plug that's a negative resistance which does not exist). The entire amount of energy delivered to the spark plug is actually held in the magnetic field generated in the primary (smaller) coil when the battery is connected and causing current to flow in the primary coils. As such you can see that there's no way more power or energy can be magically generated by a special spark plug with some sort of a capacitor. That would be a violation of the laws of thermodynamics and if it was possible the guys who invented such a thing just solved our energy crisis and would have better things to do then selling spark plugs.
So some people will now say "but the plug has a capacitor that will generates a higher voltage and thus a brighter spark". Actually first of all a capacitor doesn't boost voltage. It's call a passive component for a reason. You can use some sort of coil arrangement inside the plug to boost voltage again just like the ignition coils. However, the problem with that is you don't get any more "power". Due to inefficiencies in any transformer systems none will deliver 100% of the power at it's input to it's output.
So basically A) your ignition system provides a set amount of power and B) there's no way to make more power magically. And so all this marking BS is just that BS trying to sell you some snake oil you don't need.
Seriously if it sounds too good to be true but no car companies actually use it. It's most likely fake.