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NGK Iridium IX spark plugs are a high quality performance spark plug featuring an iridium tip for very consistent and stable spark.  Iridium also has a very high melting point which keeps it functional in a high heat, high performance engine.  The Iridium IX spark plug also features special plating to resist corrosion and seizing.  

Commonly used in the Mazdaspeed 3, Mazdaspeed 6, Mazda CX-7 and other engines.  This is a one step colder plug (higher heat range) when using on the MZR DISI engine.

LTR7IX-11 NGK Iridium IX Spark Plugs Step Colder

  • 554: 5K Ohm
    Center Electrode Core Material: Copper Core
    Center Electrode Tip Material: Iridium
    Gap Size: 0.044
    Ground Configuration: Standard
    Ground Electrode Core Material: Nickel Core
    Ground Electrode Quantity: 1
    Ground Electrode Tip Design: Taper Cut
    Hex Size: 5/8"
    Insulator Height: 53.00
    Manufacturer Heat Range: 7
    Reach: 25.00
    Resistance: 5000
    Seat Type: Tapered
    Thread Diameter: 14.00

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