Do those E-3 spark plugs work,or just another gimmic ?

Gimmick.

Kevin

I personally did a back-to-back dyno test with E3 plugs and saw a 1 horsepower gain on a 600 HP small block. I've seen greater differences doing nothing but making successive runs without changing anything.

the basic design has been around since the 50's.
if it was able to give more power, mileage, better emissions, etc, cars would come with them from the factory.

I've seen them foul up faster than most.

I think I saw on the Internet they were worth 25 horsepower per plug. Or maybe it was a dyno test write up in a racing ragazine.

Yeah, right
Some magazine writers will say anything you want them to say if you pay them enough
Some don't know the truth from Baloney sauce so they will print errors, misinformation, also
As far as multiple ground straps on spark plugs aircraft engines have used what is known as massive gap dual ground straps as long as I have known about them
I can't remember the name of another short lived spark plug company that came out with the same basic principle years back, they aren't around anymore now so ?

Sold!

Wasn't Splitfire a dual or split electrode? They were going to set the automotive world on fire too.

They rank right up there with the Tornado and Slick 50.

I think I used one in my lawnmower because it's all they had in stock and needed one since my tip broke off the Champion one. Lifetime warranty I believe. Wouldn't spend the extra money for one.