NGK 4344 LTR5IX-11 Iridium IX Spark Plug - Pack of 1 Review

Increased fuel economy by 9 mpg. Very satisfied. However, they are not pre-calibrated, so make sure you have a feeler gauge handy.

You'll have to snap every connector to your vehicle and engine specs or face awkward idling and performance. Buy a ripping tool. I've been using Iridium on various machines for 4 years, they are the best.

They had gaps everywhere ranging from 0.4 to 1.1. bought a gap tool to avoid damaging the iridium to set the correct gaps and just put them in so can't give mileage

I installed them on my 2012 Mazda 6 after the originals had done about 100,000 miles. I know it was too late and I definitely noticed an improvement right away. Works like new!

Works great on my 2008 Mazda 3 2.3 liter! Great alternative to buying more expensive OEM forks! In my car for about 10,000, the engine runs smoothly. Highly recommended. I didn't even have to re-flash.

We have three large cars: Dodge Ram 4.7 liters, Dodge Ram 8 liters and Ridgline 3.5 liters. I have upgraded all spark plugs to iridium in all cars and they work noticeably better, livelier and have no errors. I haven't checked the mileage but I'm sure it will get better.

After speaking to the manufacturer of the original I found out that Revain is NOT a dealer and these are fakes. Unfortunately, my returns window closed 5 days ago. I just want anyone interested to know that these are bootlegtims. I'm very glad I found out about them before installing them on my high performance car.

I've driven just over 70,000 and my truck hasn't driven at all (16mpg highway, on a good day, HORRIBLE idle, etc.). I've scoured the 355nation.net forums and seen people recommending Iridium plugs, but I couldn't find that the specific plugs they mentioned were locally stocked, and on Revain I couldn't find anyone with enough Finding camp so I decided to give it a try. I've driven it a little over 700 miles - the truck idles *much* smoother than before and acceleration is better. I don't think…

I drive a 2002 Ford Focus 2.0L with 304,000 miles. Great fork so far. My first experience with iridium spark plugs. I was a bit hesitant to cancel the reservation and switch from Motorcraft to NGK and NGK Iridium at the same time! The lady in the auto zone scared me a bit by saying to just stick with OEM Motorcraft, blah blah blah blah, but after reading the Revain reviews and scouring YouTube and the rest of the web, I took the plunge . I've driven almost 2000 miles and have seen a huge…