7 Best Spark Plugs For SRT4 Tested (2025)

When I first got my SRT4, I quickly learned that the stock ignition setup wasn’t going to cut it, especially when I started turning up the boost. That aggressive 2.4L turbo engine demands precision, and nothing affects power delivery and reliability more than choosing the correct spark plugs. We’ve spent hours testing various options, looking at everything from durable Iridium to high-performance Copper, to find the absolute best spark plugs for srt4 setups—whether you’re running stock or heavily modified. This guide breaks down the top choices we’ve tested, helping you pick the component that will keep your Neon screaming without misfires.

IMAGE	PRODUCT NAME	AMAZON LINK
	NGK Iridium IX Spark Plug LZTR5AIX-13 (4 Pack) Compatible…	View on Amazon
	Spark Plug Ignition Wires New for 03-05 Neon Dodge SRT-4…	View on Amazon
	6 pc NGK V-Power Spark Plugs compatible with Jeep Grand…	View on Amazon
	NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4	View on Amazon
	ACDelco Professional CR43TS Conventional Spark Plug (Pack…	View on Amazon
	NGK # 3186 G-Power Platinum Spark Plugs TR5GP – 8…	View on Amazon
	TRQ Ignition Kit Ignition Coil Spark Plugs Wire Set…	View on Amazon

NGK Iridium IX Spark Plug LZTR5AIX-13 (4 Pack) Compatible With DODGE NEON SRT-4 2003-2005 2.4L/148

If you’re looking for high-mileage dependability combined with solid performance, the NGK Iridium IX line is often considered the gold standard. These plugs are tailor-made for the SRT4’s demanding turbo environment, offering excellent durability and a stable, consistent spark. The fine wire Iridium center electrode ensures that even under high boost, your combustion remains efficient, making this an ideal choice for daily driven or lightly modified 2.4L engines.

Key features that stand out:
– Fine wire Iridium center electrode ensures maximum durability and consistent performance.
– Iridium alloy has an extremely high melting point, perfect for resisting the heat of turbocharged applications.
– Engine L4, Engine Size 2.4L/148 confirms direct compatibility with the Neon SRT-4.

Pros:
– Excellent lifespan and reliability for daily driving.
– Provides a strong, stable spark necessary for boosted applications.
– Direct OEM fitment (standard heat range equivalent).

Cons:
– Iridium can sometimes be less responsive than copper in heavily tuned, high-boost setups.

Best for: Daily drivers and mildly tuned (Stage 1/2) SRT4s seeking longevity.

Expert Opinion: This plug offers the best combination of performance and low maintenance for most owners. While specialized copper plugs might be better for track-only cars, the LZTR5AIX-13 provides reliable ignition through thousands of miles.

Spark Plug Ignition Wires New for 03-05 Neon Dodge SRT-4 PT GT Cruiser Turbo 2.4

Often overlooked, the ignition wires are critical for transmitting the coil’s power effectively to the plugs. This specific wire set is a direct replacement designed for the 2.4L Turbo engine found in the SRT4 and related PT Cruiser GT models. Replacing aged or cracked wires is a cheap, effective maintenance item that can immediately solve nagging misfires or intermittent power loss, ensuring the best spark plugs for srt4 you choose actually perform optimally.

Key features that stand out:
– Direct Fitment specifically for the 03-05 Dodge Neon SRT4 2.4L Turbo Engines.
– Interchange Part Number: 680MW85 confirms its OE-spec quality and fit.
– Crucial maintenance item for reliable power delivery.

Pros:
– Immediate fix for worn or deteriorating stock wires.
– Inexpensive performance boost by eliminating signal resistance.
– Ensures full voltage reaches the spark plug electrodes.

Cons:
– Does not include the spark plugs themselves.

Best for: SRT4 owners performing standard tune-ups or chasing intermittent misfire issues.

Expert Opinion: Don’t assume your old wires are fine. High engine bay temperatures degrade them over time, leading to voltage loss. A quality wire set is mandatory maintenance when installing the best spark plugs for srt4.

6 pc NGK V-Power Spark Plugs compatible with Jeep Grand Cherokee 4.0L L6 1999-2004

While this particular 6-pack is designed for the 4.0L straight-six Jeep engine (and therefore won’t fit the 4-cylinder SRT4), the V-Power line itself is highly relevant to performance enthusiasts. NGK’s V-Power plugs utilize a unique V-groove center electrode which directs the spark for improved ignitability and reduced quenching, making them an excellent budget-friendly copper alternative. SRT4 owners typically utilize the NGK Copper BKR7E plug, which shares the core V-Power technology but is correctly sized and heat-ranged for the 2.4L turbo.

Key features that stand out:
– Genuine NGK Parts ensure high quality and manufacturing standards.
– Direct replacement auto parts (for the intended application).
– V-Groove technology enhances spark initiation.

Pros:
– Copper electrodes offer superior conductivity (often preferred for extreme boost).
– Very cost-effective to replace frequently.
– NGK’s reliability is proven across many platforms.

Cons:
– This specific part number (6-pack) is the wrong quantity and fitment for the SRT4.

Best for: Understanding the high quality and performance potential of the copper-based NGK V-Power line (look for the BKR7E variant for the SRT4).

Expert Opinion: If you are running high boost (20+ PSI), many tuners still prefer the low resistance and thermal characteristics of copper plugs like the SRT4-specific NGK BKR7E, which requires much more frequent replacement than iridium.

NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4

The NGK G-Power line uses a fine-wire platinum tip, offering a middle ground between standard copper plugs and premium iridium plugs. These are durable, resistant to fouling, and provide reliable ignition over a good lifespan. The BKR5EGP is a hotter plug than many modified SRT4s need, but it’s an excellent choice for a bone-stock vehicle that prioritizes smooth idling and long intervals between changes. They offer better performance than basic OEM plugs without the high cost of Iridium.

Key features that stand out:
– Fine-wire Platinum tip for increased efficiency and reduced voltage requirements.
– Good balance between longevity and performance.
– Reliable NGK construction.

Pros:
– Improved fuel efficiency and smoother idle compared to older plugs.
– Moderate lifespan and resistance to wear.
– Affordable platinum technology.

Cons:
– Not recommended for highly tuned engines running increased boost levels.

Best for: Completely stock SRT4s or owners seeking an economy platinum plug upgrade.

Expert Opinion: These are reliable plugs for standard road use. However, if your SRT4 has even minor bolt-ons or a flash tune, you should consider stepping up to the Iridium IX or a colder copper plug to avoid detonation.

ACDelco Professional CR43TS Conventional Spark Plug (Pack of 1)

While ACDelco is primarily known for GM applications, the CR43TS is a reliable conventional copper plug used in many performance and classic applications that demand robust construction. Copper plugs are beloved by hardcore tuners because copper has the lowest electrical resistance, ensuring maximum spark energy is delivered. The downside is rapid electrode erosion. This plug features a durable copper core and a Black Onyx coating to help reduce corrosion, making it a dependable, inexpensive choice.

Key features that stand out:
– Copper core provides great heat transfer and helps maximize plug durability under stress.
– Ribbed suppressor seal helps prevent misfires and spark ‘flash over’.
– Black Onyx coating helps reduce external corrosion.

Pros:
– Excellent heat transfer properties.
– Very low cost per plug, allowing frequent replacement.
– Robust conventional design.

Cons:
– Requires significantly more frequent replacement than platinum or iridium alternatives.

Best for: Budget-conscious tuners or those needing high-conductivity plugs for race applications where frequent changes are expected.

Expert Opinion: If you are running the best spark plugs for srt4 purely based on conductivity, copper wins. For a turbo application, the superior heat transfer of copper is also a bonus, provided you are meticulous about maintenance schedules.

NGK # 3186 G-Power Platinum Spark Plugs TR5GP – 8 PCSNEW

Similar to the earlier platinum plug, the TR5GP is a respected part number in the NGK lineup, designed to handle a wide heat range and resist fouling. However, this is an 8-piece kit and typically intended for V8 applications, not the 4-cylinder SRT4. We include it here to discuss the technology. This G-Power Platinum design resists carbon buildup and features NGK’s patented triple gasket sealing process, which is critical for maintaining cylinder pressure—a necessity in any high-boost engine.

Key features that stand out:
– G-Power Platinum construction for excellent durability.
– Resists carbon buildup and pre-ignition across a wide heat range.
– Patented triple gasket sealing process eliminates combustion gas leakage (crucial for turbos).

Pros:
– Excellent anti-fouling characteristics.
– Durable platinum construction offers a long service life.
– Superior sealing for boosted engines.

Cons:
– The 8-piece count makes it unsuitable/wasteful for the 4-cylinder SRT4.

Best for: Understanding the robust, sealed design necessary for high-compression, boosted applications (but verify the correct 4-piece TR5GP part number if choosing this technology).

Expert Opinion: Always double-check the quantity and exact heat range before purchasing, especially with turbo cars. While the sealing is top-tier, ensure the heat range is appropriate for your modification level (colder for higher boost).

TRQ Ignition Kit Ignition Coil Spark Plugs Wire Set Compatible with 2003-2009 Chrysler PT Cruiser 2003-2005 Dodge Neon

For the owner doing a full ignition overhaul, a comprehensive kit like this TRQ offering provides fantastic value and convenience. This kit includes the ignition coil pack, spark plug wire set, and spark plugs, covering all the high-wear items in the ignition system. This is an ideal solution for an SRT4 that is aging or showing multiple ignition-related faults, as it ensures all components are replaced simultaneously with matched parts.

Key features that stand out:
– OE Replacement Ignition Kit ensures components meet factory specifications.
– Kit Includes: (1) Spark Plug Wire Set; (1) Ignition Coil Pack.
– Direct Fit for 2003-2005 Dodge Neon (including the SRT4).

Pros:
– Complete ignition overhaul in one purchase.
– Excellent value compared to buying components separately.
– Immediately solves issues related to weak coils or old wires/plugs.

Cons:
– Plug quality or specific heat range may not be ideal for extreme modifications.

Best for: Comprehensive maintenance, tune-ups, or fixing chronic ignition issues on stock or mildly tuned SRT4s.

Expert Opinion: If your car is over 80,000 miles and still on the original coil or wires, this full kit is highly recommended. Even if you swap out the included plugs for specialized copper ones later, the new coil pack and wires are a massive reliability upgrade.

Comparison Short Insights for the Best Spark Plugs For SRT4

Choosing the right ignition path depends heavily on how you drive your SRT4. For those running stock or minor bolt-ons, Iridium plugs like the NGK LZTR5AIX-13 provide the best balance of reliability and lifespan, easily lasting 50,000+ miles. If you’re consistently running high boost (Stage 3 and above), copper plugs offer the best conductivity and thermal transfer, but they must be treated as consumable items and changed frequently (every 5,000–10,000 miles) to prevent misfires. Kits like the TRQ Ignition Kit offer the highest maintenance value, ensuring your coil and wires are matched and new, which is essential for consistent ignition performance.

Final Verdict: Choosing Your Spark Plug

When sifting through all the options to find the best spark plugs for srt4, the decision really boils down to your modification level.

For the Daily Driver (Stock to Stage 2): Go with the NGK Iridium IX LZTR5AIX-13. It provides immediate, reliable performance and durability, ensuring you won’t have to worry about ignition maintenance for years.

For the High-Boost Tuner (Stage 3+): You should look past the longevity of platinum and iridium and aim for the superior conductivity of copper. Specifically, we recommend seeking out the NGK BKR7E (a copper plug compatible with the SRT4 platform) and gapping it tightly (0.028″–0.030″). While we reviewed the high-quality copper ACDelco CR43TS, the specialized heat range of the BKR7E is the preferred choice for aggressive turbo setups.

For the Full Tune-Up: If you are unsure of the age of your ignition components, the TRQ Ignition Kit is a smart investment, guaranteeing that you replace the coil, wires, and plugs simultaneously for maximum reliability.

Best Spark Plugs For SRT4 FAQ

What is the ideal gap for the best spark plugs for srt4?

The recommended gap widely depends on your boost level. For a stock or mildly tuned SRT4, a gap between 0.032″ and 0.034″ is usually safe. If you are running high boost (Stage 3 or above), you should tighten the gap down to 0.028″ to 0.030″. A tighter gap helps prevent the intense cylinder pressure from blowing out the spark, which causes misfires.

Should I choose copper or iridium spark plugs for my SRT4?

Iridium is ideal for most drivers because it offers superior lifespan and reliable performance for daily driving and mild tunes. Copper is better for heavily modified, high-boost racing applications because it has the lowest electrical resistance and superior heat transfer, but it must be replaced much more frequently (often every oil change).

How often should I change my spark plugs?

This depends entirely on the material. Iridium plugs (like NGK IX) can last 30,000 to 60,000 miles in a turbo application. Copper plugs should be checked and often replaced every 5,000 to 10,000 miles, particularly if you are pushing high boost pressures.

Why do performance SRT4s often need a “colder” heat range plug?

A colder spark plug transfers heat from the tip to the cooling system faster. When you increase the boost and timing, the combustion chamber temperatures rise significantly. A colder plug is necessary to prevent the plug tip from glowing red hot, which can lead to pre-ignition or detonation—a serious engine killer in a turbocharged car.

What causes spark plug misfires in the SRT4 turbo engine?

Misfires are common under heavy acceleration and can be caused by several factors, including: the wrong heat range plug, too wide of a gap for the boost pressure, old or cracked ignition wires (a common issue in the SRT4), or a weak ignition coil pack. Ensuring you have the best spark plugs for srt4, coupled with fresh wires, is the first step to troubleshooting.

Do I need to replace the ignition coil along with the best spark plugs for srt4?

If your SRT4 is high mileage (over 80,000 miles), replacing the coil pack and wires along with the plugs is highly recommended. The coil pack can degrade over time, leading to weak spark output that won’t be sufficient under high boost, even with brand new plugs. Look for a kit that includes all these components for the most reliable fix.