Beat-a-Price Guarantee - You Find It, We'll Beat It!

Beat-a-Price Guarantee - You Find It, We'll Beat It!

Shop Deals On Street Rod Upgrades & Get Rolling Today!

Availability

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.

Showing In Stock Items. Show All 80 Items.

Results 1 - 25 of 42

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

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

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LZTR7AIX-13

NGK Iridium IX Spark Plugs LZTR7AIX-13

NGK Iridium IX Spark Plugs LZTR7AIX-13

Spark Plug, LZTR7AIX-13, Iridium IX, 14mm Thread, 0.984 in. Reach, Tapered Seat, 5/8 in. Hex, Each

Part Number: NGK-5107

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs YR5IX

NGK Iridium IX Spark Plugs YR5IX

NGK Iridium IX Spark Plugs YR5IX

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

Part Number: NGK-7516

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs UR45IX

NGK Iridium IX Spark Plugs UR45IX

NGK Iridium IX Spark Plugs UR45IX

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

Part Number: NGK-7559

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BR9EIX

NGK Iridium IX Spark Plugs BR9EIX

NGK Iridium IX Spark Plugs BR9EIX

Spark Plug, IX Iridium, 14mm Thread, .750 in. Reach, 13/16 in. Hex, Gasket Seat, Resistor, Each

Part Number: NGK-3981

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs LZTR6AIX-13

NGK Iridium IX Spark Plugs LZTR6AIX-13

NGK Iridium IX Spark Plugs LZTR6AIX-13

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

Part Number: NGK-2315

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs CR9EIX

NGK Iridium IX Spark Plugs CR9EIX

NGK Iridium IX Spark Plugs CR9EIX

Spark Plug, Iridium IX, Gasket Seat, 10mm Thread, .750 in. Reach, Resistor, Each

Part Number: NGK-3521

5.0 out of 5 stars ( 5 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs DCPR9EIX

NGK Iridium IX Spark Plugs DCPR9EIX

NGK Iridium IX Spark Plugs DCPR9EIX

Spark Plug, Iridium, 12mm Thread, .750 in. Reach, 5/8 Hex, Gasket Seat, Resistor, Each

Part Number: NGK-2316

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BR8EIX

NGK Iridium IX Spark Plugs BR8EIX

NGK Iridium IX Spark Plugs BR8EIX

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

Part Number: NGK-5044

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs IZFR6J

NGK Iridium IX Spark Plugs IZFR6J

NGK Iridium IX Spark Plugs IZFR6J

Spark Plug, Iridium, 14mm Thread, .750 in. Reach, 5/8 in. Hex, Gasket Seat, Resistor, Each

Part Number: NGK-4462

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BR7EIX

NGK Iridium IX Spark Plugs BR7EIX

NGK Iridium IX Spark Plugs BR7EIX

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

Part Number: NGK-6664

Not Yet Reviewed

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs DCPR7EIX SOLID

NGK Iridium IX Spark Plugs DCPR7EIX SOLID

NGK Iridium IX Spark Plugs DCPR7EIX SOLID

Spark Plug, NGK DCPR7EIX SOLID Iridium IX Series Spark Plug, 19mm Reach, 12mm Thread, Heat Range 7, Flat Seat, 5/8 Hex, .031 in. Gap, Each

Part Number: NGK-97637

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs CR10EIX

NGK Iridium IX Spark Plugs CR10EIX

NGK Iridium IX Spark Plugs CR10EIX

Spark Plug, Gasket Seat, 10mm Thread, .750 in. Reach, Resistor, Each

Part Number: NGK-6482

Not Yet Reviewed

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

NGK Iridium IX Spark Plugs BPR7EIX

NGK Iridium IX Spark Plugs BPR7EIX

NGK Iridium IX Spark Plugs BPR7EIX

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

Part Number: NGK-4055

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Tuesday 9/2/2025

...Loading

Estimated Ship Date: Tuesday 9/2/2025

Modal Header

Call To Order

This is a custom order part. You can order this part by Contacting Us.

Summit Racing Speedcard. Synchrony Car Care.

Summit Racing Equipment SpeedCard

Jumpstart Your Next Project!

View Details|See if you Prequalify