I recently changed my plugs and installed factory Champions as a majority here do, but frankly am not happy with them. It feels as if I have lost power and I can VERIFY I lost mpg. They were gapped at factory spec.
I keep reading and seeing nothing but positive results on these E3 spark plugs, but have any of you actually run them? Your thoughts?
I also have the 5.9 gas motor.

Thanks for info!

 

i use them on my hemi and i def felt better idle and lil bit better milage but major. as far as hp gain i seen on tv it added 8 crank hp on chevy 350 so i duno.

 

ya horsepower tv did a dyno with them and they said they improve hp and fuel millage.

 

on the E3 sparkplug?

 

horsepower tv will tell you meth is awesome for your teeth if the money is right.

 

I was going to agree. What you see on TV and what you yourself see on the dyno are two different things. Im not doubting they might be a better plug but I believe very liitle I see on TV and just because "they" say so.