NGKIridium IX Spark Plugs TR55IX # 7164

The best plugs for Japanese cars

Fits great works. Great, we'll buy again.

I noticed better performance with these than the stock plugs. So far so good. Great plugs for the price and definitely recommend.

Used for 5.4ll engine. They also can be used for a 4.6l as well. I haven't had any issues with so far.

Long lasting and durable. Have always performed best in my truck. No special tools needed for installation, perfectly spaced right out of the box.

NGK makes some of the best spark plugs out there in my experience and they are less pricey than some of the other top brands. They always perform well and never disappoint.

Bought these plugs to replace platinum plugs that lasted about thirty thousand miles.I did have to gap all of them to specifications.That is a trivial matter.I bought these plugs because according to my research they are made of the hardest material out there on the market for plugs.I' am expecting at least 70,000 miles before change out,that I can not attest to only time will tell.However I did feel a significant difference in performance. I replaced the plug coils with summit high performance coils because I still had an occasional engine miss fire after replacing the plugs.Since replacing both spark plugs and coils,engine runs smooth,quite, no more engine miss fire,much improved engine performance and improved mileage per gallon.If you replace your plugs and still have engine performance issues,change your spark plug wires and or coils depending on what your engine uses.Replace all of them at the same time not just one or two.These items were replaced on a high performance Crown Victoria engine.GOT IT--GET IT.

Checked with nkg to make sure they were authentic and they are authentic NKG spark plug iridium IX so at least you know if you purchase from the seller they are authentic I'll update this at a later time have not installed them yet