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Denso Iridium Race Spark Plugs

This is our secret weapon spark plug for high horsepower direct injected LNF, LHU, and LTG cars (500+whp) where we start to have issues with the electrode burning off.  This has a different style tip which doesn't burn off and cause valve train/piston/block damage like the other plugs can.

Iridium Power® plugs are for drivers that care about performance as well as drivers that care about mileage. These plugs best demonstrate their performance improvement during acceleration. The world's smallest center electrode (0.4mm) and specially shaped ground electrode delivers maximum spark energy while withstanding temperatures greater than 4000º F. These features combine to achieve higher ignitability and require lower spark voltage than ever before. As a result, acceleration improves in comparison with normal plugs.


  • Tapered cut, U-Groove ground electrode
  • 0.4mm iridium center electrode
  • 360-degree laser welding assembly process
  • Required ignition voltage reduced
  • Unsurpassed center electrode durability

These work in LNF, LHU, & LTG

Comes in a set of 4.

Customer Reviews
4.6 Based on 11 Reviews
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Randy M.
United States United States
Just right

Just what it needed

Rodrigo S.
United States United States
Denso Plugs

Well, I’ll have to say that I am no mechanic expert and I did very poor research. I used these on my ZZP tunes 2013 ATS. I used a forum which stated these plugs should be gapped at .036. I gapped these Denso plugs and installed them. For some reason I didn’t believe that was right. Apparently, ZZP has a tech page on the website, and come to find out the plugs come pre-gapped with correct measure. I contacted my tuner right away to see if I needed to regap and/or retune. I was informed as long as I’m not getting misfires at high rpm to leave it alone. To date I have had no misfires and plugs are working well. ZZP has top quality tested products and I stand by their research and the products they put out. Be sure to check out ZZP online tech guides for any information on their products. A very useful resource guide.

Benjamin M.
United States United States
Good purchase, good deal!

Good product good price

Tom W.
Canada Canada
nice set of plug

plugs work very well. just don't use them with **** injection, don't seem to like it. got my car to 30 psi and 15 degrees timing on 94 with these babies without kr. definitely recommend. if you have **** injection. use something else, just couldn't get it to behave together.

David D.
United States United States

It was very good thank you you guys have the best performance parts for my ATS 2.0... And I will continue buying parts from ZZP