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$75–$200 laborOpen full visualizer →
Great entry-level mod for any build
Compatible Vehicles
2022 Dodge Challenger R/T(5.7L HEMI V8)
2022 Dodge Challenger R/T Scat Pack(6.4L HEMI V8)
Fits all 5.7L and 6.4L dual-plug HEMI. Stock heat range — for NA or lightly modded engines.
NGK
Iridium IX Spark Plugs (HEMI 16-Pack)
SKU: 6509-LTR6IX-11
View on NGK website5.0across 1 reviews
$50.80
Skill Level
Bolt-on
Install Time
1-2 hours
Build Stage
Stage 1 — Basic Bolt-Ons
View on Car
See replacement target on car →Estimated Install Cost
Total with part: $125.80–$250.80
Warranty Safe
50-State Legal
What You'll Need
Spark plug socket, torque wrench, anti-seize compound.
Great entry-level mod for any build
Compatible Vehicles
2022 Dodge Challenger R/T(5.7L HEMI V8)
2022 Dodge Challenger R/T Scat Pack(6.4L HEMI V8)
Fits all 5.7L and 6.4L dual-plug HEMI. Stock heat range — for NA or lightly modded engines.
Available variants
This product comes in 2 variants. Pick the one that matches your engine or trim.
What Does This Do?
The HEMI's dual-plug design means you need 16 spark plugs instead of the usual 8. NGK's Iridium IX plugs use an ultra-fine iridium center electrode that requires less voltage to fire, produces a more focused spark, and lasts significantly longer than copper plugs. The stock heat range (IX) is perfect for naturally aspirated engines — even with bolt-on mods like intakes and exhausts. If you're adding forced induction (supercharger/turbo), you'll want a colder heat range to prevent pre-ignition under the higher combustion temperatures. These are the go-to replacement plugs for most HEMI owners.
Why Install This?
Benefits
- More reliable combustion under high load and boost
- Longer service life compared to stock plugs, especially with forced induction
- Easy bolt-on installation — most people can do this in their driveway with basic tools
Where does this go on the car?
Iridium IX Spark Plugs (HEMI 16-Pack) changes 1 primary stock component (highlighted red). Included or supporting pieces are listed below.
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Red = primary stock component changed
Primary install target (1)
- Spark Plugs
Specifications
1 attributes| Heat Range | 1-Step Colder1 |
Sources: 1Fasthemis
Price Comparison
Compare prices across 1 retailer — every link opens the real product page
Best price
$50.80
at FastHemis
Frequently Asked Questions
Will the Iridium IX Spark Plugs (HEMI 16-Pack) fit my car?
Verified fitment includes 2022 Dodge Challenger. The full compatibility list is shown in the Compatible Vehicles section above; if your specific year/trim is not listed, double-check with the retailer before purchase.
Based on product data
How hard is it to install the Iridium IX Spark Plugs (HEMI 16-Pack)?
This is rated as an easy bolt-on install (1-2 hours). Most owners complete it in a driveway with hand tools.
Based on product data
Do I need anything else to install the Iridium IX Spark Plugs (HEMI 16-Pack)?
Plan on having or sourcing: Spark plug socket, torque wrench, anti-seize compound.. The build planner on this site flags missing supporting parts when you add this kit to a build.
Based on product data
Spark Plugs & Ignition buyer's guide
How to pick spark plugs & ignition for your Challenger — what matters, what doesn't, and what to avoid.
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