E3 Spark Plugs E3.54 Premium Automotive Spark Plug with DiamondFIRE Technology, 14mm Thread Diameter, 0.708” Reach, Taper Seat, Resistor, Pack of 1

The only type of sparkplug that I install on 2000 Chevy 1500 or Chevy 2500 HD, due to the racing plug design that will never foul out backed by 5-year 50,000 mile warranty.

have been using e3 spark plugs in everything from cars ,trucks to lawn tractors since december 09 . since that time i have installed these spark plugs in over a dozen vehicles with nothing but good results . as one reveiwer stated alot of the problems some of the reviewers might be having is cracked spark plugs as we have had a few diyers come in with same problems. after fixing the problem with new exact same plugs they were very satisfied. the plugs work , would not hesitate to buy.

I have noticeably more power and gas mileage. I live 17.8 miles from work and I usually burn a 1/4 tank of gas to and from work with a 2002 cadillac escalade awd. I burned 1/4 on 3 trips so essentially I got a free 18 miles.

I installed a set in my 1987 Bronco II that was having trouble starting on cold mornings. I don't know that there was a noticeable improvement in power, but the cold starts make these worth the extra money.

These E3 plugs DO NOT work in a 2006 Chevy Tahoe. Terrible. The gap cannot be adjusted and the fixed gap from the factory is far too large. These E3 plugs caused terrible misfires in multiple cylinders constantly. Just terrible. 2006 Tahoe must have a .040" gap. Never again.

Love these plugs I have bought them for my 93 eclipse 99 Silverado and my 04 Grand Prix. Great product just wish they would pack the individual box’s better for shipment.

I started using E3 Spark Plugs back in (around) 2005. At that time I was close to 200 Thousand Miles on my 2000 Chevy Silverado Z71 LS 1500 Series, 5.3 Liter, 8 Cylinder Truck. Even though they don't need it, I put in a Fresh Set of E3 Spark Plugs every July and I am just shy of 400 Thousand miles now on my Truck and it runs as smooth as when I drove it off the lot. Last Month I was experiencing a Mis Fire on Cylinder 8 (I had decided to skip replacing my plugs the past two years in a row). I thought, Ok, let's put in a new set. Swapped out the Plugs and purrs like a kitten.

They performed very good and add some hp & mpg however, I replaced them after 40,000miles and one of the came out with the ceramic briken and nowhere to be found. Possibly with a broken valve because some of the metal crown went with it. It does give you power but I have to be honest about my situation. Good luck!

work great in a 2012 serria 1500 wt 5.3 O

They show 1 package of 4 plugs in the ad and it looked like you order 2 packs of 4 but they are singles!Really!

This is a good product, however I was a bit taken back at the price. Found out I can get the same plug at Canadian Tire for 17 bucks.