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NGK Iridium IX High-Performance Car Spark Plugs

Top brands like NGK, DENSO, Autolite, and Champion help maximize your engine’s power and performance. We carry thousands of automotive spark plugs for everything from a Chevy to a Ford or a Volkswagen to a Toyota, all backed by our 100% fitment guarantee. Browse popular series, including NGK Iridium, NGK Racing, and NGK G-Power, to find the perfect replacement spark plugs for your vehicle.

NGK spark plugs and DENSO spark plugs, plus those from Autolite, Bosch, and Champion, help maximize engine power and operating performance ride after ride. We carry thousands of spark plugs for everything from Chevy to Ford, Volkswagen to Toyota, all with a 100% fitment guarantee. Browse popular spark plugs including NGK Iridium, NGK Racing, NGK G-Power, and many more replacement spark plugs. Ensure they’re well protected in the Cylinder Head and properly connected via the Coil Boots when replacing them.

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  1. NGK Iridium IX
    16 pc NGK Iridium IX Spark Plugs for 2011-2021 Ram 1500 5.7L V8
    Rating:
    98%
    34  Reviews
    Special Price $135.73 Regular Price $193.99
    NGK / NTK
  2. NGK Iridium IX
    8 pc NGK Iridium IX 6510 LTR7IX-11 Spark Plugs
    Rating:
    73%
    3  Reviews
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  3. NGK Iridium IX
    4 pc NGK Iridium IX 3521 CR9EIX Spark Plugs
    Rating:
    95%
    4  Reviews
    Special Price $29.94 Regular Price $42.99
    NGK / NTK
  4. NGK Iridium IX
    8 pc NGK Iridium IX 4469 LFR5AIX-11 Spark Plugs
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  5. NGK Iridium IX
    NGK Iridium IX 2309 LFR7AIX Spark Plug
    Special Price $8.15 Regular Price $11.99
    NGK / NTK
    Out of stock
  6. NGK Iridium IX
    8 pc NGK Iridium IX 2309 LFR7AIX Spark Plugs
    Special Price $58.99 Regular Price $83.99
    NGK / NTK
    Out of stock
  7. NGK Iridium IX
    16 pc NGK Iridium IX Spark Plugs for 2009-2020 Dodge Challenger 5.7L V8
    Rating:
    100%
    1  Review
    Special Price $138.50 Regular Price $197.99
    NGK / NTK
  8. NGK Iridium IX
    8 pc NGK Iridium IX 6509 LTR6IX-11 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $58.99 Regular Price $83.99
    NGK / NTK
  9. NGK Iridium IX
    4 pc NGK Iridium IX 2667 BKR7EIX Spark Plugs
    Special Price $29.34 Regular Price $41.99
    NGK / NTK
  10. NGK Iridium IX
    4 pc NGK Iridium IX 6510 LTR7IX-11 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $29.34 Regular Price $41.99
    NGK / NTK
  11. NGK Iridium IX
    8 pc NGK Iridium IX 7397 TR5IX Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  12. NGK Iridium IX
    NGK Iridium IX 2313 LZTR4AIX-11 Spark Plug
    Special Price $7.74 Regular Price $10.99
    NGK / NTK
  13. NGK Iridium IX
    NGK Iridium IX 2668 BKR8EIX Spark Plug
    Special Price $8.15 Regular Price $11.99
    NGK / NTK
  14. NGK Iridium IX
    6 pc NGK Iridium IX 4469 LFR5AIX-11 Spark Plugs
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  15. NGK Iridium IX
    16 pc NGK Iridium IX Spark Plugs for 2009-2020 Dodge Charger 5.7L V8
    Rating:
    100%
    2  Reviews
    Special Price $138.50 Regular Price $197.99
    NGK / NTK
  16. NGK Iridium IX
    8 pc NGK Iridium IX 3690 TR7IX Spark Plugs
    Rating:
    100%
    2  Reviews
    Special Price $58.99 Regular Price $83.99
    NGK / NTK
  17. NGK Spark Plug
    6 pc NGK Iridium IX Spark Plugs for 2011-2019 Ford F-150 3.5L V6
    Special Price $56.12 Regular Price $79.99
    NGK / NTK
  18. NGK Iridium IX
    6 pc NGK Iridium IX 6619 LFR6AIX-11 Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  19. NGK Iridium IX
    6 pc NGK Iridium IX 2668 BKR8EIX Spark Plugs
    Rating:
    90%
    2  Reviews
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  20. NGK Iridium IX
    8 pc NGK Iridium IX Spark Plugs for 2011-2019 Ford Mustang 5.0L 5.2L V8
    Rating:
    80%
    1  Review
    Special Price $70.99 Regular Price $100.99
    NGK / NTK
  21. NGK Iridium IX
    8 pc NGK Iridium IX 7164 TR55IX Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  22. NGK Iridium IX
    6 pc NGK Iridium IX 2669 BKR9EIX Spark Plugs
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  23. NGK Iridium IX
    8 pc NGK Iridium IX 2669 BKR9EIX Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  24. NGK Iridium IX
    6 pc NGK Iridium IX Spark Plugs for 2005-2019 Nissan Frontier 4.0L V6
    Rating:
    100%
    2  Reviews
    Special Price $55.22 Regular Price $78.99
    NGK / NTK
  25. NGK Iridium IX
    4 pc NGK Iridium IX 6418 BKR6EIX Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $29.34 Regular Price $41.99
    NGK / NTK
  26. NGK Iridium IX
    NGK Iridium IX 7803 DPR7EIX-9 Spark Plug
    Rating:
    100%
    1  Review
    Special Price $7.99 Regular Price $10.99
    NGK / NTK
  27. NGK Spark Plug
    6 pc NGK Iridium IX 93175 LKR7DIX-11S Spark Plugs
    Rating:
    100%
    2  Reviews
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  28. NGK Iridium IX
    4 pc NGK Iridium IX Spark Plugs for 2009-2018 Toyota RAV4 2.5L L4
    Special Price $40.08 Regular Price $56.99
    NGK / NTK
  29. NGK Iridium IX
    4 pc NGK Iridium IX Spark Plugs for 2006-2019 Toyota Yaris 1.5L L4
    Rating:
    100%
    1  Review
    Special Price $39.98 Regular Price $56.99
    NGK / NTK
  30. NGK Spark Plug
    4 pc NGK Iridium IX Spark Plugs for 2012-2016 Hyundai Elantra 1.8L 2.0L L4
    Special Price $39.27 Regular Price $55.99
    NGK / NTK
  31. NGK Iridium IX
    8 pc NGK Iridium IX Spark Plugs for 2007-2020 Toyota Tundra 4.6L 5.7L V8
    Rating:
    80%
    3  Reviews
    Special Price $71.18 Regular Price $101.99
    NGK / NTK
  32. NGK Spark Plug
    NGK Iridium IX 93175 LKR7DIX-11S Spark Plug
    Rating:
    100%
    2  Reviews
    Special Price $8.15 Regular Price $11.99
    NGK / NTK
  33. NGK Iridium IX
    2 pc NGK Iridium IX 2477 ZFR5FIX-11 Spark Plugs
    Special Price $15.41 Regular Price $21.99
    NGK / NTK
  34. NGK Iridium IX
    16 pc NGK Iridium IX Spark Plugs for 2009-2020 Dodge Durango 5.7L V8
    Rating:
    100%
    1  Review
    Special Price $138.50 Regular Price $197.99
    NGK / NTK
  35. NGK Iridium IX
    6 pc NGK Iridium IX Spark Plugs for 2003-2007 Infiniti G35 3.5L V6
    Rating:
    100%
    4  Reviews
    Special Price $55.22 Regular Price $78.99
    NGK / NTK
  36. NGK Iridium IX
    4 pc NGK Iridium IX 2202 DPR8EIX-9 Spark Plugs
    Special Price $29.94 Regular Price $42.99
    NGK / NTK
  37. NGK Iridium IX
    6 pc NGK Iridium IX 2667 BKR7EIX Spark Plugs
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  38. NGK Iridium IX
    6 pc NGK Iridium IX 6418 BKR6EIX Spark Plugs
    Special Price $44.46 Regular Price $63.99
    NGK / NTK
  39. NGK Iridium IX
    4 pc NGK Iridium IX 6482 CR10EIX Spark Plugs
    Special Price $29.94 Regular Price $42.99
    NGK / NTK
  40. NGK Iridium IX
    8 pc NGK Iridium IX 4344 LTR5IX-11 Spark Plugs
    Special Price $58.99 Regular Price $83.99
    NGK / NTK
  41. NGK Iridium IX
    8 pc NGK Iridium IX Spark Plugs for 2014-2019 Chevrolet Corvette 6.2L V8
    Rating:
    100%
    2  Reviews
    Special Price $70.99 Regular Price $100.99
    NGK / NTK
  42. NGK Iridium IX
    NGK Iridium IX 6509 LTR6IX-11 Spark Plug
    Rating:
    100%
    1  Review
    Special Price $7.99 Regular Price $10.99
    NGK / NTK
  43. NGK Iridium IX
    8 pc NGK Iridium IX 3689 TR6IX Spark Plugs
    Rating:
    100%
    1  Review
    Special Price $57.81 Regular Price $82.99
    NGK / NTK
  44. NGK Iridium IX
    8 pc NGK Iridium IX Spark Plugs for 2011-2017 Ford F-150 5.0L V8
    Rating:
    100%
    4  Reviews
    Special Price $72.44 Regular Price $102.99
    NGK / NTK
  45. NGK Spark Plug
    16 pc NGK Iridium IX Spark Plugs for 2015-2020 Dodge Challenger 6.2L V8
    Special Price $138.50 Regular Price $197.99
    NGK / NTK
  46. NGK Iridium IX
    4 pc NGK Iridium IX 2477 ZFR5FIX-11 Spark Plugs
    Special Price $29.94 Regular Price $42.99
    NGK / NTK
  47. NGK Spark Plug
    6 pc NGK Iridium IX Spark Plugs for 2008-2019 Honda Odyssey 3.5L V6
    Special Price $55.22 Regular Price $78.99
    NGK / NTK
  48. NGK Iridium IX
    4 pc NGK Iridium IX 5044 BR8EIX Spark Plugs
    Special Price $29.94 Regular Price $42.99
    NGK / NTK
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The Sixity Auto Advantage

Finding the right car spark plugs can seem complicated, but our goal is to make it simple. We combine a massive selection of parts from trusted brands with the expert, US-based support you need to make the right choice. With fast shipping and a 100% fitment guarantee, we provide a hassle-free shopping experience that has earned the trust of over a million customers.

Platinum, Iridium, and More

Choosing the right material is key to your engine’s performance and longevity. We carry a massive selection of aftermarket spark plugs in every type, from long-lasting iridium to dependable copper plugs for classic vehicles. Whatever your engine needs, we have the right plug to match its specific requirements, ensuring optimal spark and efficiency.

Expert Support When You Need It

Not sure which plug is right for your vehicle? Our friendly, US-based customer support team is here to help. With deep knowledge of our full catalog, they can guide you to the perfect car spark plugs for your specific make and model. We are committed to helping you buy with confidence and getting your installation done right the first time.

Frequently Asked Questions

Got a question about our automotive spark plugs? Here are a few things people often ask. For anything else, our main FAQ page has you covered.

How do I find the right spark plugs for my car?

Your best bet is our vehicle selector tool. Just plug in your car’s info, and we’ll show you exactly which plugs are guaranteed to work.

Are your aftermarket spark plugs as good as the originals?

Definitely. We only carry parts that are as good or better than the ones that came in your car, but without those dealership prices.

How often should I replace car spark plugs?

That really depends on the type. A standard copper plug is usually good for about 20,000 miles, while a high-end iridium one can last 100,000. Your owner’s manual will have the exact schedule for your engine.

Spark Plug Features

  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
  • Precision ceramic insulators
  • Corrosion-resistant shell with triple high pressure gas seals
  • Screw or snap-on electrical connectors
  • Pre-installed metal compression gaskets
  • Copper-core electrode cooling
  • Application specific heat-range design
  • Improved cold-starting performance
  • Smooth firing at high or low engine RPM
  • Reduced electrode erosion and long service life
  • Enhanced ignition efficiency and fuel economy
  • Superior anti-fouling characteristics
  • Reduced hot-spark firing voltage requirements
  • Maximum engine horsepower and torque
  • Superior throttle-response, acceleration and WOT performance
  • Precision Laser-welded Iridium electrodes - 6X harder than platinum
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