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NGK Spark Plugs

NGK Iridium IX Spark Plugs

4.86 out of 5 stars 249 Customer Reviews

NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs—and just thin enough to create an accurate and consistent spark. They represent the ultimate evolution of spark plug technology and performance. Iridium is the hardest metal used in spark plugs today—six times harder than platinum. This allowed NGK engineers to reduce the voltage requirement for a spark. Iridium IX plugs are available in more than a hundred configurations for universal and vehicle-specific applications.

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NGK Iridium IX Spark Plugs for 2006-2007 6, 2014 CTS, 2014-2015 XTS - LTR7IX-11

NGK Iridium IX Spark Plugs for 2006-2007 6, 2014 CTS, 2014-2015 XTS - LTR7IX-11

NGK Iridium IX Spark Plugs for 2006-2007 6, 2014 CTS, 2014-2015 XTS - LTR7IX-11

Spark Plug IX Iridium, 14mm Thread, 25mm Reach, 5/8 in. Hex, Tapered Seat, Resistor, Each

Part Number: NGK-6510

4.69 out of 5 stars ( 13 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LFR5AIX-11

NGK Iridium IX Spark Plugs LFR5AIX-11

NGK Iridium IX Spark Plugs LFR5AIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, 1.043 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-4469

4.86 out of 5 stars ( 14 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs TR6IX

NGK Iridium IX Spark Plugs TR6IX

NGK Iridium IX Spark Plugs TR6IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .708 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3689

5.0 out of 5 stars ( 10 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs for 2006-2009 STS, XLR - TR7IX

NGK Iridium IX Spark Plugs for 2006-2009 STS, XLR - TR7IX

NGK Iridium IX Spark Plugs for 2006-2009 STS, XLR - TR7IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .708 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3690

5.0 out of 5 stars ( 13 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LTR6IX-11

NGK Iridium IX Spark Plugs LTR6IX-11

NGK Iridium IX Spark Plugs LTR6IX-11

Spark Plug, IX Iridium, 14mm Thread, 0.984 in. Reach, 5/8 in. Hex, Tapered Seat, Resistor, Each

Part Number: NGK-6509

4.43 out of 5 stars ( 7 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs TR55IX

NGK Iridium IX Spark Plugs TR55IX

NGK Iridium IX Spark Plugs TR55IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .708 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7164

4.97 out of 5 stars ( 29 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LTR5IX-11

NGK Iridium IX Spark Plugs LTR5IX-11

NGK Iridium IX Spark Plugs LTR5IX-11

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .984 in. Reach, Resistor, Each

Part Number: NGK-4344

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR8EIX

NGK Iridium IX Spark Plugs BKR8EIX

NGK Iridium IX Spark Plugs BKR8EIX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-2668

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LFR7AIX

NGK Iridium IX Spark Plugs LFR7AIX

NGK Iridium IX Spark Plugs LFR7AIX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, 1.043 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-2309

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR7EIX

NGK Iridium IX Spark Plugs BKR7EIX

NGK Iridium IX Spark Plugs BKR7EIX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-2667

5.0 out of 5 stars ( 6 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR9EIX

NGK Iridium IX Spark Plugs BKR9EIX

NGK Iridium IX Spark Plugs BKR9EIX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-2669

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs UR4IX

NGK Iridium IX Spark Plugs UR4IX

NGK Iridium IX Spark Plugs UR4IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .460 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7401

4.78 out of 5 stars ( 9 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs TR8IX

NGK Iridium IX Spark Plugs TR8IX

NGK Iridium IX Spark Plugs TR8IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .708 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3691

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs XR5IX

NGK Iridium IX Spark Plugs XR5IX

NGK Iridium IX Spark Plugs XR5IX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .375 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7355

5.0 out of 5 stars ( 7 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LKR7DIX-11S

NGK Iridium IX Spark Plugs LKR7DIX-11S

NGK Iridium IX Spark Plugs LKR7DIX-11S

Spark Plug, IX Iridium, 12mm Thread, 1.040 in. Reach, 5/8 in. Hex, Gasket Seat, Resistor, Each

Part Number: NGK-93175

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs WR5IX

NGK Iridium IX Spark Plugs WR5IX

NGK Iridium IX Spark Plugs WR5IX

Spark Plug, Iridium IX, Tapered Seat, 18mm Thread, .460 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7510

4.33 out of 5 stars ( 6 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LTR6IX

NGK Iridium IX Spark Plugs LTR6IX

NGK Iridium IX Spark Plugs LTR6IX

Spark Plug, Iridium IX, 14mm Thread, 25mm. Reach, Resistor, Tapered Seat, Each

Part Number: NGK-94374

Not Yet Reviewed

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs UR5IX

NGK Iridium IX Spark Plugs UR5IX

NGK Iridium IX Spark Plugs UR5IX

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, .460 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-7177

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR6EIX

NGK Iridium IX Spark Plugs BKR6EIX

NGK Iridium IX Spark Plugs BKR6EIX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-6418

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR5EIX-11

NGK Iridium IX Spark Plugs BKR5EIX-11

NGK Iridium IX Spark Plugs BKR5EIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-5464

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LZTR5AIX-13

NGK Iridium IX Spark Plugs LZTR5AIX-13

NGK Iridium IX Spark Plugs LZTR5AIX-13

Spark Plug, Iridium IX, Tapered Seat, 14mm Thread, 25mm Reach, Projected Tip, Resistor, Each

Part Number: NGK-2314

5.0 out of 5 stars ( 4 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LFR6AIX-11

NGK Iridium IX Spark Plugs LFR6AIX-11

NGK Iridium IX Spark Plugs LFR6AIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, 1.043 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-6619

5.0 out of 5 stars ( 3 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs ZNAR7AIX

NGK Iridium IX Spark Plugs ZNAR7AIX

NGK Iridium IX Spark Plugs ZNAR7AIX

Spark Plug, Iridium, Projected Tip, 12mm Thread, 26.5mm Reach, Tapered Seat, Each

Part Number: NGK-7554

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BKR6EIX-11

NGK Iridium IX Spark Plugs BKR6EIX-11

NGK Iridium IX Spark Plugs BKR6EIX-11

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Projected Tip, Resistor, Each

Part Number: NGK-3764

4.8 out of 5 stars ( 10 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs GR4IX

NGK Iridium IX Spark Plugs GR4IX

NGK Iridium IX Spark Plugs GR4IX

Spark Plug, Iridium IX, Gasket Seat, 14mm Thread, .750 in. Reach, Resistor, Each

Part Number: NGK-97382

3.67 out of 5 stars ( 3 )

Estimated Ship Date: Tuesday 9/2/2025

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Estimated Ship Date: Tuesday 9/2/2025

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