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NGK Iridium IX Spark Plugs (5.7L, 6.4L)

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NGK Iridium IX Spark Plugs (5.7L, 6.4L)NGK Iridium IX Spark Plugs (5.7L, 6.4L)NGK Iridium IX Spark Plugs (5.7L, 6.4L)
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NGK Iridium IX Spark Plugs (16-pack)

The Spark Plug serious enthusiasts rely on. Designed specifically for the performance enthusiast.  Iridium IX offers extreme ignitability, improved throttle response and superior anti fouling

  • Fine Iridium tip ensures high durability and a consistently stable spark
  • Iridium alloy has extremely high melting point, perfect for today’s high-tech, high-performance engines
  • Trivalent Metal Plating - superior anti-corrosion and anti-seizing properties
  • Outstanding acceleration, high fuel efficiency and durability
  • Ultimate design, technology and performance.
  • 16 spark plugs included. 
  • These are a tapered seat spark plug

 NGK Iridium IX Laser Spark Plugs fit the following 5.7L V8 vehicles

  • 2009+ RAM 1500 5.7L
  • 2011+ Jeep Grand Cherokee 5.7L
  • 2009+ Jeep Commander 5.7L
  • 2009+ Chrysler 300 5.7L
  • 2009+ Dodge Durango 5.7L
  • 2008+ Dodge Challenger RT 5.7L
  • 2008+ Dodge Charger RT 5.7L

     NGK Iridium IX Spark Plugs fit the following 6.4L V8 vehicles

    • 2011+ Jeep Grand Cherokee SRT 6.4L
    • 2018+ Dodge Durango SRT 6.4L
    • 2012+ Dodge Charger SRT 6.4L
    • 2012+ Dodge Challenger SRT 6.4L
    • 2012+ Chrysler 300 SRT 6.4L


    PLEASE NOTE: TAPERED SEAT SPARK PLUG. Some engine's are equipped with "gasket seat" plugs from the factory. Our NGK plugs will replace a gasket seat or taper seat plug.

    Pro Tips:

    • Check Spark plug gap! Never install a spark plug without first checking gap and carefully adjusting if necessary. (these plugs are NOT pre-gapped)
    • Supercharged vehicle - Use .032 gap.
    • Non-supercharged vehicle - Use factory specified gap. (see fsm)
    • Iridium spark plugs have a delicate Iridium electrode. When gapping use high quality gapping tools and feeler gauges. If using a traditional plug gapper avoid contact with the Iridium electrode at all times. Manipulate the plug's ground strap only!
    • Inspect plugs for hairline cracks and damage before installation. Plugs can be mishandled, dropped and damaged. Carefully inspect a plug's electrode, porcelain and ceramic portion. 
    • Apply Anti-seize compound to spark plug threads.
    • Apply dielectric grease to coil pack/spark plug wire boot.
    • Always tighten to manufacturer's recommended torque spec. 
    • Read your old spark plugs; Reading an older plug removed from an engine can play a crucial roll in engine health! Check old Gap!: Checking gap on a old plug that's been removed is commonly overlooked! Recording gap size on a used plug will help the user determine how often plugs should be serviced. As plugs wear the gap will increase in size. Coloration: The color of the insulator nose and electrodes can indicate if a engine is operating smoothly or requires some adjustments. Deposits: Examining deposits on the spark plug can reveal information about the fuel and oil consumption.

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