E3 Spark Plugs E3.40 Performance Spark Plug

from Group 44

At one time, I ordered some of these plugs from someone beside Jeg's. They were delivered via USPS, but all losly packed. 3 of them arrived broken. Not so much with Jeg's. I love these plugs, I love their service. Life long fan and customer here for sure.

from RB277

I installed this on a 1971 Mustang 351C M code 3 years ago, made an immediate and noticeable improvement. Burns through slight oil leak, fires hotter and I could feel the added Horsepower. Tried it on a 2004 Buick LaSaber V6 a few years ago did not work as well in it.

from Grinreaper56

I have installed these plugs in many vehicles. They have always, always been an upgrade. The main improvement I've noticed is that vehicles have better throttle response off the line and through the bottom end. Some rigs also had a little improvement in gas mileage. They are indeed a low cost upg...

from Group 44

At one time, I ordered some of these plugs from someone beside Jeg's. They were delivered via USPS, but all losly packed. 3 of them arrived broken. Not so much with Jeg's. I love these plugs, I love their service. Life long fan and customer here for sure.

from RB277

I installed this on a 1971 Mustang 351C M code 3 years ago, made an immediate and noticeable improvement. Burns through slight oil leak, fires hotter and I could feel the added Horsepower. Tried it on a 2004 Buick LaSaber V6 a few years ago did not work as well in it.