Iridium IX Spark Plug
Hover over the image to zoom in
Share this:

NGK Iridium IX Spark Plug

Part No. 2667 Warranty Details  

See if this part fits a specific vehicle.

Check Vehicle Fit

Laser-welded iridium center electrode is resistant to heat, corrosion and electrical wear. The tapered ground electrode minimizes quenching. Provides outstanding acceleration, high fuel efficiency and durability.

Product Features:
  • 0.6 mm iridium-tip center electrode provides durability and a high melting point
  • Taper-cut ground electrode shape provides improved flame reproduction
Back To Top
Electrode Core Material:Iridium
Electrode Tip Material:Iridium
Ground Strap Quantity:1
Manufacturer Heat Range:7
Shorty Spark Plug:No
Spark Plug Reach:3/4 in
Spark Plug Seat Type:gasket
Spark Plug Thread Size:14 mm
Tip Configuration:Solid
Type:Iridium IX
Wrench Diameter:5/8 in


by PowerReviews
NGKIridium IX Spark Plug

(based on 1 review)

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Reviewed by 1 customer

Displaying review 1

Back to top


OEM Replacement; Enough Said


from USA

About Me Auto Enthusiast, Casual Driver, Competitive Driver

Verified Buyer


  • Durable
  • Easy To Install
  • Improves Engine Efficiency


  • No Improvement In Performance

Best Uses

  • Everyday Driving
  • Performance Driving
  • Racing
  • Replacement
  • Restoration

Comments about NGK Iridium IX Spark Plug:

These are what is recommended by Honda for the Civic for 2006-2011, however, I put them in my 2005 Civic Si, and they perform much better than the exact replacement ones for the K20A3. These are especially good if you are modding in a Civic Si, RSX, RSX Type-S, or anything else with a K20 engine. No, they don't provide a performance increase, but they will if you have mods that require them. But that isn't because of the spark plugs to begin with.

Comment on this reviewHelp Icon

Check out the specials in our monthly flyer.
Disclaimer We strive to keep all information accurate and up-to-date; however, product availability, pricing, promotions and store hours are subject to change without notice. Please contact Customer Care if you have any questions or corrections.