Denso Iridium Race Spark Plugs


5 reviews

This product is currently out of stock.

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
5.0 Based on 5 Reviews
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Jessie L.
United States United States
Good plugs

Replaced these with the factor plugs, definitely seem to idle a little smoother. Spark is just as important to your car as any other part.

Blake D.
United States United States
Very nice

I have a lot of modifications done and one I put these on my car ran smoker and my MPG went way up

Justin C.
United States United States
Pretty dang good

Yup... They are spark plugs.... And they do as advertised... Creat spark to run the engine ... Lol Haven't had an issue with spark blow out and did see a slight .5 mpg increase in fuel economy.

Darren S.
United States United States
2016 Camaro upgrade

The products was very, very easy to install money well spent. Thanks ZZP...

Antoine S.
Canada Canada
Denso spark plugs

Work as advertised, service from zzp is escellent!

ZZPerformance Denso Iridium Race Spark Plugs Review