their site

anyone saw these before?

think it's 100% legit?

I'd be worried about the pulse plugs going bad faster than regular spark plugs do, considering the immense size of the "pulse" they make.

Other than that, yes, I would like to have the option to tune my car for better fuel efficiency (while potentially getting more power as a side effect).

I'd be worried about preignition. By their own claim, Pulse plugs ignite faster, further and with more force than standard plugs. Without some timing adjustments, that's a good way to get engine knock.

sounds like another unnecessary "super performance" spark plug, which probably won't really give any better results than a good spark plug. At $25/plug, that's an expensive experiment to take. Reminds me of those Bosch +4 platinum plugs. They brag about all the power, but at least in the S-Series, they generally just cause misfires and power loss.

What's the mileage rating on this plug?