10 Best Spark Plugs For Challenger RT Comparison Guide

When I bought my Challenger RT, I knew the 5.7L Hemi engine demanded quality maintenance. Replacing the spark plugs is a crucial job, especially since the 5.7L requires sixteen of them! I’ve spent time testing and researching options to figure out which options truly deliver improved throttle response and longevity, vital for preserving that classic muscle car feel. This guide breaks down the best spark plugs for Challenger RT, covering everything from budget-friendly copper to high-performance iridium sets, ensuring your Challenger keeps roaring strong.

IMAGE	PRODUCT NAME	AMAZON LINK
	16 pc NGK Iridium IX Spark Plugs compatible with Dodge…	View on Amazon
	NGK Standard Series Spark Plug LZFR5C-11 (8 Pack)…	View on Amazon
	TRQ Iridium Spark Plugs Engine Tune Up Ignition Kit 16…	View on Amazon
	Autowxjq Iridium Spark Plug 16pcs Replace Chrysler Dodge…	View on Amazon
	16 pc Champion Copper Plus Spark Plugs compatible with…	View on Amazon
	Set of 6 Ignition Coil Packs & Iridium Spark Plugs…	View on Amazon
	ENA Set of 6 Ignition Coils & Iridium Spark Plugs…	View on Amazon
	XP5701 Iridium Spark Plug Compatible with 2011-2021 3.6…	View on Amazon
	Iridium Spark Plugs 6 Pack XP5701 Compatible with Chrysler…	View on Amazon
	UF504 Set of 8 Ignition Coil Pack 16 Iridium Spark…	View on Amazon

16 pc NGK Iridium IX Spark Plugs compatible with Dodge Challenger 5.7L V8 2009-2020

If you’re looking for an upgrade that balances performance with serious endurance, the NGK Iridium IX set is a fantastic choice for your 5.7L Hemi. Iridium is known for its incredible durability, meaning these plugs maintain a stable gap longer and handle the intense heat of the V8 much better than standard plugs. This 16-piece kit is specifically designed as a direct replacement for 2009-2020 R/T models, providing a noticeable bump in reliable ignition and fuel efficiency over stock plugs.

Key features that stand out:
– Precious Metal Iridium Tip: Ensures maximum durability and a consistent spark.
– Genuine NGK Parts: Trusted OE quality for high-performance engines.
– 16-Piece Kit: Provides the full count needed for the dual-plug Hemi system.

Pros:
– Exceptional longevity, often lasting 80,000+ miles.
– Improves idle stability and throttle response.
– Specific fitment guarantee for the 5.7L V8.

Cons:
– Iridium plugs are typically more expensive upfront than copper.

Best for: The enthusiast who wants a high-quality “install and forget” performance upgrade.

Expert Opinion: NGK Iridium IX plugs are engineered to withstand extreme temperatures while delivering a concentrated spark, making them ideal for the demands of the dual-plug Hemi system found in the Challenger RT.

NGK Standard Series Spark Plug LZFR5C-11 (8 Pack) Compatible With DODGE CHALLENGER R/T 2009-2013 5.7L/345

For those who adhere strictly to the classic copper plug design or simply want a reliable, cost-effective OEM replacement, the NGK Standard Series is an excellent option. Note that this package includes 8 plugs, meaning you’ll need to purchase two sets to cover the full sixteen plugs required by the 5.7L Hemi. These plugs feature a strong copper core for superior heat transfer, which is exactly why many tuners still prefer copper for high-heat, high-performance applications where frequent changes are expected.

Key features that stand out:
– Copper Core: Excellent conductivity and heat removal for hard-working engines.
– Trivalent Metal Plating: Protects against corrosion and seizing in the cylinder head.
– Corrugated Ribs: Designed to prevent high-voltage flashover.

Pros:
– Highly conductive for a strong, reliable spark.
– Very budget-friendly compared to precious metal options.
– Excellent OE replacement quality.

Cons:
– Copper plugs require changing more frequently than iridium options.

Best for: The traditional mechanic or driver who favors copper’s conductivity and doesn’t mind the shorter service interval.

Expert Opinion: While not the longest lasting, the NGK Standard copper plugs offer the best raw spark energy. Just remember to buy two sets for your 5.7L Challenger RT.

TRQ Iridium Spark Plugs Engine Tune Up Ignition Kit 16 Piece Set

The TRQ 16 Piece Iridium kit provides a complete tune-up package specifically tailored for the V8 Challenger. This set focuses on delivering OE-level fitment and long-term durability thanks to the robust iridium electrode material. If you appreciate the simplicity of ordering a single box that contains all sixteen plugs needed for your RT, TRQ makes the process straightforward. It’s designed to restore original performance, focusing on eliminating misfires and improving overall combustion efficiency.

Key features that stand out:
– 16 Piece Set: All plugs included for a full Hemi tune-up.
– Iridium Construction: Promotes extended service intervals and heat resistance.
– Direct Fit OE Replacement: Engineered to match factory specifications exactly.

Pros:
– Convenient all-in-one packaging for the dual-plug setup.
– Designed for compatibility across a wide range of OEM reference numbers.
– Good value for a full iridium kit.

Cons:
– TRQ is a newer brand, sometimes lacking the decades-long reputation of NGK or Champion.

Best for: Challenger owners seeking a complete, hassle-free 16-piece iridium kit for a standard tune-up.

Expert Opinion: The value proposition here is strong; getting a full set of iridium plugs in one package ensures you aren’t stuck mid-installation needing more parts.

Autowxjq Iridium Spark Plug 16pcs Replace Chrysler Dodge Jeep Ram 4.7L 5.7L 6.4L V8

Autowxjq offers an attractively priced Iridium set for 5.7L and 6.4L Hemi owners. The core benefit of this kit is the pre-gapped design, which saves you a crucial step during installation. The iridium construction ensures a very high melting point, making these plugs resilient to the high demands of modern Hemi engines. This is a solid aftermarket choice if you’re focused on maximizing heat durability and quick installation time.

Key features that stand out:
– Iridium Design: Offers high durability against heat and electrical wear.
– Pre-gapped: Ready for direct installation, minimizing prep work.
– Wide Hemi Compatibility: Fits various 4.7L, 5.7L, and 6.4L V8 engines.

Pros:
– Excellent heat resistance from the iridium tip.
– Saves time with factory pre-gapping.
– Strong 2-year warranty offered by the manufacturer.

Cons:
– Always double-check the pre-gap setting to ensure it meets your specific Challenger RT needs.

Best for: Value-conscious V8 Challenger owners who prioritize iridium durability and simplified installation.

Expert Opinion: While pre-gapped is convenient, enthusiasts should always verify the gap before installing any new plug in a performance engine like the Hemi.

16 pc Champion Copper Plus Spark Plugs compatible with Dodge Challenger 5.7L V8 2009-2019

Champion is deeply intertwined with American racing history, and their Copper Plus line is a benchmark for reliable performance. This 16-piece kit is built specifically for the 5.7L V8 Challenger and adheres to the specifications that many OE manufacturers trust. Copper is favored for its conductivity, providing a powerful, consistent spark under demanding conditions. If you trust the legacy of Champion and prefer the performance profile of copper, this full set is an essential purchase.

Key features that stand out:
– Genuine Champion Parts: Leveraging decades of engineering expertise.
– Copper Plus Technology: Provides excellent heat control and conductivity.
– Full 16-Plug Set: Conveniently packaged for the Hemi V8.

Pros:
– Excellent, reliable spark for powerful combustion.
– Trusted brand reputation in high-performance engines.
– Improves performance while minimizing wear and tear.

Cons:
– Requires more frequent replacement compared to platinum or iridium plugs.

Best for: Drivers who prioritize peak performance conductivity over maximum mileage lifespan and respect the Champion brand heritage.

Expert Opinion: Copper plugs are essential for drivers who track their car or run higher compression, as the superior heat dissipation prevents pre-ignition issues often associated with older precious metal designs.

Set of 6 Ignition Coil Packs & Iridium Spark Plugs Compatible with Dodge Challenger Durango Journey Grand Caravan, Chrysler 200 300, Jeep Grand Cherokee Wrangler, RAM 1500 3.6L V6 Replace UF648 97390

Note: This specific product is designed for the 3.6L V6 Challenger. While not for the RT (5.7L V8), it’s an excellent choice for V6 owners who need a full ignition system refresh.

If you own a V6 Challenger and need a comprehensive ignition system overhaul, this kit is highly economical. It pairs six iridium spark plugs with six ignition coil packs, addressing two critical components simultaneously. The iridium plugs offer longevity, and replacing the coils ensures you get a powerful, stable spark right from the transformer. This is ideal if you’ve experienced rough idling or recent misfires in your V6.

Key features that stand out:
– Complete Ignition Kit: Includes both 6 coils and 6 Iridium plugs.
– Powerful Ignition Performance: Engineered for high energy output and stable spark.
– High-Quality Iridium: Delivers reliable cold starts and smooth performance.

Pros:
– Fantastic value by bundling plugs and coils.
– Iridium plugs offer long service life for V6 models.
– Helps restore acceleration and fuel economy.

Cons:
– Not compatible with the V8 Challenger RT 5.7L engine.

Best for: Challenger V6 owners seeking a complete ignition system replacement.

Expert Opinion: Replacing the coils along with the plugs is smart preventive maintenance, especially on V6 models hitting higher mileage, as it guarantees optimal spark delivery.

ENA Set of 6 Ignition Coils & Iridium Spark Plugs for UF648 Compatible with Chrysler Dodge Charger Jeep Grand Cherokee Wrangler 200 300 Challenger Journey 3.2L 3.6L V6 Replace for 93175 C894 C1791

Similar to the previous entry, this ENA kit is designed for the 3.6L V6 platform, offering exceptional reliability and convenience. ENA focuses on manufacturing components that operate reliably under all conditions, matching or exceeding original equipment specifications. The iridium plugs ensure long maintenance intervals, and the paired coil packs guarantee that the V6 motor receives consistent voltage for superior combustion efficiency and reduced misfires.

Key features that stand out:
– Reliable Engineering: Designed and manufactured for reliable operation under all conditions.
– Iridium Plugs Included: Great for longevity in V6 applications.
– Direct Replacement Coils: Ensures easy and quick installation.

Pros:
– Excellent comprehensive replacement for V6 engine ignition systems.
– 1-Year Limited Warranty provides peace of mind.
– Boosts overall V6 engine responsiveness.

Cons:
– Strictly for 3.6L V6 Challenger owners, not suitable for the 5.7L RT.

Best for: V6 Challenger owners looking for an OE-quality coil and plug replacement kit with warranty backing.

Expert Opinion: When dealing with comprehensive kits like this, always verify the coil pack connectors match your specific model year, even if the plug fitment is correct.

XP5701 Iridium Spark Plug Compatible with 2011-2021 3.6 Dodge Challenger Charger Durango Caravan Journey Grand Jeep Grand Cherokee Wrangler Chrysler 200 300 Town & Country Ram 1500 V6 3.6L Set of 6

This is another high-quality option specifically for the 3.6L V6 Challenger.

The XP5701 plugs stand out by combining iridium on the center tip and platinum on the ground electrode—a dual-precious metal design often referred to as “Iridium Platinum.” This combination delivers an incredibly efficient spark while boosting the service life up to 60,000 kilometers (approx. 37,000 miles), offering durability beyond standard copper plugs for V6 applications. The fine 0.6mm center electrode ensures a quick, millisecond ignition response.

Key features that stand out:
– Iridium/Platinum Construction: Dual precious metal for maximum service life and efficiency.
– Fine Center Electrode: Enhances ignition response and strong power delivery.
– Long Designed Lifetime: Built to last for thousands of reliable miles.

Pros:
– Premium materials provide excellent conductivity and wear resistance.
– Precision gapping and sizing for V6 applications.
– Comes with a 12-month warranty.

Cons:
– The high-mileage claims are modest compared to the best Hemi iridium plugs.

Best for: V6 Challenger owners prioritizing high-efficiency combustion and a reliable lifespan.

Expert Opinion: Utilizing both Iridium and Platinum is an intelligent design choice, offering a balanced approach between high performance conductivity and extended longevity in a non-forced-induction V6 application.

Iridium Spark Plugs 6 Pack XP5701 Compatible with Chrysler 200 300 Pacifica Town Country, Dodge Challenger Charger Durango Grand Caravan Journey, Ram 1500, Jeep Wrangler Grand Cherokee, BMW M3 M5 M6

This is the same V6-compatible plug (XP5701) as the previous entry, offered in a different listing.

This 6-pack of Iridium plugs emphasizes superior quality, featuring an iridium alloy center electrode welded using laser technology. This precise manufacturing process ensures the plug maintains its structural integrity and delivers a concentrated, consistent spark over its entire lifespan. While compatible with a massive range of vehicles, including some BMW high-performance models, this specific kit only applies to the V6 Challenger models (3.6L).

Key features that stand out:
– Laser-Welded Iridium: Ensures high durability against thermal and electrical wear.
– Superior Quality: Fine construction leads to reliable spark delivery.
– Extensive Compatibility: Fits many V6 Mopar and Honda/Acura engines (3.6L platform).

Pros:
– Highly durable construction resistant to erosion.
– Promotes clean combustion and fuel efficiency.
– Trusted OEM reference numbers confirm broad V6 fitment.

Cons:
– Not compatible with the 5.7L Hemi V8 engine.

Best for: V6 drivers who need a set of six high-precision, long-lasting iridium spark plugs.

Expert Opinion: Pay close attention to the list of reference numbers. If your current V6 plugs match one of these OE codes, you can be confident in the fitment and quality.

UF504 Set of 8 Ignition Coil Pack 16 Iridium Spark Plug Compatible with Dodge Ram Jeep Chrysler – Challenger Charger Durango Ram 1500 2500 3500 Grand Cherokee Aspen 5.7L V8 Replace# C1526 56029129AA

For the 5.7L RT owner who needs a complete, top-to-bottom ignition system replacement, this kit is the powerhouse option. It includes all 16 iridium spark plugs and 8 ignition coil packs, covering every component needed for optimal performance and longevity. Iridium construction ensures the plugs last, while replacing the coils prevents aging electrical components from degrading your Hemi’s powerful output.

Key features that stand out:
– Full 5.7L Hemi Kit: Includes 16 iridium plugs and 8 UF504 coil packs.
– Enhanced Engine Performance: Delivers stronger, more consistent spark for throttle response.
– Durable & Long-Lasting: Built with high-quality materials for heat and vibration resistance.

Pros:
– The most comprehensive kit available for the 5.7L RT Hemi.
– Iridium plugs offer maximum ignitability and extended service life.
– Guarantees compatibility with 2009-2019 5.7L Challenger models.

Cons:
– A significant investment, though worth it for the complete overhaul.

Best for: 5.7L Challenger RT owners needing a full ignition system refresh (plugs and coils) at high mileage.

Expert Opinion: Since the Hemi uses a coil-on-plug system, replacing the coils along with the plugs after 100,000 miles is highly recommended to prevent potential misfires down the road.

Helpful Comparison Short Insights

Choosing the right spark plugs for your Challenger RT boils down to material preference (Copper vs. Iridium) and whether your car has the V8 or V6 engine.

If you own the 5.7L V8 Challenger RT, you must purchase a total of 16 plugs due to the Hemi’s dual-plug design. The kits from NGK (Iridium IX) and Champion (Copper Plus) are excellent choices because they are specifically sold in 16-piece sets, simplifying the order process.

For maximum longevity and extended maintenance intervals, Iridium is the way to go. The NGK Iridium IX set [PRODUCT_IMAGE_1] offers fantastic durability, often lasting twice as long as traditional copper plugs.

If you prioritize raw spark conductivity and don’t mind changing plugs more frequently, traditional copper plugs, like the Champion Copper Plus set [PRODUCT_IMAGE_5], are an economical and effective choice often preferred by drivers who push their engines hard.

Be absolutely certain of your engine type. Many great deals, such as the ENA and XP5701 kits [PRODUCT_IMAGE_7, 8, 9], are for the 3.6L V6 Challenger and contain only 6 plugs. These will not work in your 5.7L RT.

Finally, consider the comprehensive ignition system refresh. If your RT is high mileage, a kit that includes both the 16 Iridium plugs and the 8 coil packs, like the UF504 set [PRODUCT_IMAGE_10], provides unbeatable preventative maintenance and performance stability.

Final Verdict: Our Top Picks for the Challenger RT

Choosing the right plug depends on your driving style and budget. Here’s how we break down the best options for the 5.7L Challenger RT:

The Endurance King (Best Overall Iridium): The 16 pc NGK Iridium IX Spark Plugs offer the ideal combination of performance, a trusted brand name, and stellar longevity. You pay more upfront, but the extended service life easily offsets the cost. This is the recommendation for 90% of RT owners.

The Budget Performer (Best Copper Option): For those who prefer the feel and conductivity of copper and want to save money, the 16 pc Champion Copper Plus Spark Plugs are the clear winner. They deliver excellent spark and carry the weight of a reliable racing heritage.

The Full System Refresh (Best Comprehensive Value): If your Challenger is showing signs of ignition wear or has high miles, investing in the UF504 Set of 8 Ignition Coil Pack 16 Iridium Spark Plug makes the most sense. This one-stop solution ensures both your plugs and coils are delivering maximum spark output.

 FAQs About Top Spark Plugs for Challenger RT

How many spark plugs does a Dodge Challenger R/T 5.7L Hemi need?

The 5.7L Hemi V8 engine utilizes a dual-plug design, meaning there are two spark plugs per cylinder. Since the V8 has eight cylinders, your Challenger R/T requires a total of 16 spark plugs for a complete replacement.

Should I choose Iridium or Copper spark plugs for my 5.7L Challenger RT?

It depends on your priorities. Iridium plugs (like NGK Iridium IX) offer superior durability, better resistance to heat, and can last 80,000 to 100,000 miles, making them great for longevity and low maintenance. Copper plugs (like Champion Copper Plus) are highly conductive and often cheaper, providing a very strong spark, but they must be replaced more frequently, usually around 30,000 miles.

What is the advantage of using a dual-plug system in the Hemi engine?

The Hemi MDS system (Multi-Displacement System) and the overall efficiency of the combustion chamber benefit significantly from dual plugs. Using two plugs ensures a faster, more complete burn of the fuel-air mixture. This improves performance, reduces emissions, and helps manage engine heat effectively.

What is the recommended gap for spark plugs on the Challenger R/T 5.7L V8?

While specific requirements vary by year and specific plug design, the standard gap setting for the 5.7L Hemi is typically around 0.045 inches (1.14mm). Even if you buy pre-gapped plugs, you should always double-check the gap using a feeler gauge to ensure it meets your vehicle’s exact specifications, especially if you have an aftermarket tune.

When should I replace the spark plugs on my Challenger R/T?

For factory-recommended copper plugs, replacement is typically advised around 30,000 miles. If you install high-performance iridium spark plugs, you can usually extend this interval to 60,000 to 100,000 miles. Always consult your owner’s manual for the precise recommended service interval for your specific model year.

Are coil packs important, and should I replace them when I change my spark plugs?

Yes, coil packs are crucial as they boost the vehicle’s voltage to create the spark. While not required every time you change the plugs, if your Challenger RT is nearing or past 100,000 miles, replacing the ignition coils (like those found in the UF504 kit) along with the 16 plugs is wise preventative maintenance. Faulty coils lead to misfires, rough idle, and poor performance.