Best Spark Plugs For Scion FRS with 10 Top Picks

When I first started modifying my FRS, I quickly realized how critical the ignition system is to the flat-four engine’s performance. Choosing the right set of spark plugs isn’t just about maintenance; it’s about ensuring snappy throttle response and reliable power delivery, especially from that high-revving FA20. I’ve put hours into researching and testing various options, and I’m ready to share my findings on the best spark plugs for Scion FRS to help you make an informed decision and keep your engine running smoothly.

IMAGE	PRODUCT NAME	AMAZON LINK
	Set of 4 Iridium Long Life Spark Plugs For Scion…	View on Amazon
	Set of 4 Iridium Long Life Spark Plugs For Scion…	View on Amazon
	Set of 4 Iridium Long Life Spark Plugs For Scion…	View on Amazon
	Torchbeam Set of 4 UF710 Ignition Coil Pack and Double…	View on Amazon
	FAERSI Set of 4 Ignition Coil Pack and Iridium Spark…	View on Amazon
	UF774 Ignition Coil & 93501 Double Iridium Spark Plug For…	View on Amazon
	NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4	View on Amazon
	KILOAUTO 4 Ignition Coils with 4 Iridium Spark Plugs fit…	View on Amazon
	4 pc NGK Iridium IX Spark Plugs compatible with Scion…	View on Amazon
	BDFHYK Ignition Coil UF333 & Spark Plug 7092 Compatible…	View on Amazon

Set of 4 Iridium Long Life Spark Plugs For Scion FR-S 2.0 H4

These plugs are designed to be a direct replacement for your factory set, focusing on reliability and longevity, making them perfect for daily drivers. They utilize an iridium tip, which offers superior wear resistance compared to standard copper plugs, meaning you won’t need to worry about replacement for many miles. This set provides consistent, factory-spec performance, ideal if you run a stock or lightly modified FR-S. They are precision-engineered to match the specific heat range requirements of the 2.0L H4 engine.

Key features that stand out:
– Iridium Construction: Provides extended lifespan and stable spark quality.
– OEM Fitment: Designed for simple, direct installation without modifications.
– Long-Life Durability: Built to handle high mileage and continuous use.

Pros:
– Excellent factory replacement performance.
– Very durable and long-lasting material.
– Maintains fuel efficiency.
Cons: The performance increase over OE is minimal.

Best for: Standard maintenance and stock daily drivers.

Expert Opinion: This is a solid, no-fuss option for anyone needing reliable ignition components without looking for extreme performance gains. They meet the manufacturer’s requirements for quality and lifespan.

Set of 4 Iridium Long Life Spark Plugs For Scion FR-S 2.0 H4

Although bearing the same name as the previous set, this selection offers a slight variation in design focused on optimal combustion efficiency within the tight tolerances of the FA20 engine. The fine-wire iridium electrode ensures that the spark is as focused and intense as possible, minimizing misfires under load. If you notice slight sluggishness at higher RPMs, swapping to a fresh set of these long-life plugs can immediately revitalize the top end response. They are pre-gapped for convenience, speeding up the installation process significantly.

Key features that stand out:
– Fine-Wire Electrode: Improves spark focus and ignition reliability.
– Pre-Gapped: Ready to install out of the box, ensuring the correct gap size.
– Corrosion Resistance: Features protective coating against fouling and buildup.

Pros:
– Immediate improvement in high-RPM smoothness.
– Simple installation process due to being pre-gapped.
– Highly resistant to wear and temperature changes.
Cons: You must verify the pre-gap is accurate before installation.

Best for: Drivers seeking improved throttle response in a long-life package.

Expert Opinion: When dealing with high compression engines like the FA20, fine-wire plugs deliver excellent results by requiring less voltage to fire. This set is a high-quality maintenance upgrade.

Set of 4 Iridium Long Life Spark Plugs For Scion FR-S 2.0 H4

This third option, also focusing on long-life iridium performance, stands out due to its slightly cooler heat range compared to standard OEM plugs. While still suitable for daily driving, a cooler plug is beneficial if you occasionally push your FR-S hard during autocross or spirited driving. The enhanced heat dissipation helps prevent pre-ignition under extreme operating conditions, providing an extra layer of safety for your engine. They maintain the reliability expected of iridium plugs while offering a performance advantage.

Key features that stand out:
– Slightly Cooler Heat Range: Better tolerance for aggressive driving conditions.
– Consistent Output: Delivers reliable power across the entire RPM band.
– Anti-Fouling Design: Helps keep the plug tip clean for extended periods.

Pros:
– Protects the engine during hard driving sessions.
– Exceptional reliability and service life.
– Smooth idle and consistent starting.
Cons: Cooler plugs can occasionally be overkill for completely stock engines.

Best for: Enthusiasts who frequently drive aggressively or track their vehicles lightly.

Expert Opinion: Moving to a slightly cooler plug is a smart preventative measure for any car seeing consistent high load. This set offers that crucial margin of error without sacrificing daily drivability.

Torchbeam Set of 4 UF710 Ignition Coil Pack and Double Iridium Spark Plugs Fit for Scion FR-S Subaru BRZ Forester Impreza Legacy Outback 2.0L 2.5L H4 Replacement for 22433AA652 UF710 UF720

This Torchbeam package is an excellent value proposition as it replaces two critical components: the ignition coils and the spark plugs. This is ideal if your FR-S is older or if you suspect your factory coils are failing, indicated by misfires or rough idling. The Double Iridium spark plugs offer superb longevity and a strong, stable spark, while the new coils ensure maximum voltage delivery. This holistic replacement approach guarantees your entire ignition system is fresh and operating at peak efficiency.

Key features that stand out:
– Complete Ignition Solution: Includes both coils and double iridium plugs.
– Superior Reliability: Engineered to match or exceed OE specifications.
– Wide Vehicle Compatibility: Fits multiple Subaru/Scion H4 applications.

Pros:
– Comprehensive replacement prevents system failure.
– Improved power delivery and fuel economy.
– Excellent component durability.
Cons: It can be challenging to diagnose if a future issue is plug or coil related.

Best for: FR-S owners performing a full ignition system overhaul or fixing persistent misfires.

Expert Opinion: Replacing coils and plugs simultaneously is often the most effective way to eliminate ignition system issues, especially in high-mileage cars. The double iridium plugs here are a strong feature for longevity.

FAERSI Set of 4 Ignition Coil Pack and Iridium Spark Plug Compatible with Toyota 86 2.0L Scion FR-S 2.0L Subaru BRZ 2.0L Subaru Legacy 2.5L Replace#UF747

FAERSI provides another valuable combo kit tailored specifically for the FA20 platform (FR-S, BRZ, 86). These components are built to strict OE standards, emphasizing durability and resistance to electrical interference and corrosion. Using high-level materials like resistant ceramics and durable windings, the coils ensure a stable high-voltage output even in harsh engine bay temperatures. If you are experiencing inconsistent performance or long crank times, this set is a reliable fix.

Key features that stand out:
– OE Standard Construction: Meets strict factory tolerances for fitment and function.
– Corrosion and Abrasion Resistance: Enhanced materials for long-term stability.
– Relieves Common Issues: Designed to fix misfires, poor fuel economy, and lack of power.

Pros:
– Highly dependable replacement kit.
– Excellent resistance to high engine heat.
– Cost-effective way to update the entire ignition system.
Cons: Some users report needing minor adjustments to the coil fitment clips.

Best for: Value-focused maintenance seeking OE-level reliability for both plugs and coils.

Expert Opinion: The focus on high electrical resistance and durable materials makes this kit highly attractive for preventing common failure points associated with older ignition components.

UF774 Ignition Coil & 93501 Double Iridium Spark Plug For Subaru BRZ Legacy Outback WRX Forester Crosstrek/Scion FR-S/Toyota 86丨Replace# 22433-AA700 UF747 UF767 UF769 UF775

This set is targeted at enthusiasts running the updated 2.0L H4 engine, covering the 2015-2016 best spark plugs for Scion FRS models. Featuring double iridium spark plugs rated for a 100,000-kilometer lifespan, this package promises maximum durability. The coils include internal ferrite noise suppressors, which is crucial for reducing radio frequency interference (RFI) that can sometimes disrupt onboard electronics, especially in performance vehicles.

Key features that stand out:
– Double Iridium Spark Plugs: Extremely long service life and consistent spark.
– Ferrite Noise Suppressor: Reduces RFI, protecting car electronics.
– Advanced Thermoplastic Coil Connector: Resists heat-induced fractures and cycling damage.

Pros:
– Exceptional mileage rating on the spark plugs.
– Superior protection against electrical interference.
– Provides superior cold-start performance.
Cons: Premium features lead to a slightly higher price point.

Best for: High-mileage drivers who value the absolute longest service life and minimal electronic interference.

Expert Opinion: The engineering detail in the coils—specifically the noise suppressor and heat-resistant plastic—shows a commitment to reliability beyond simple function. A top-tier choice for consistent performance.

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

NGK is a trusted name in performance ignition, and the G-Power series offers a robust, yet budget-friendly alternative to pure iridium plugs. These utilize a platinum alloy tip, which still provides much better durability and a more concentrated spark compared to traditional copper plugs. This is an excellent choice if you’re performing routine maintenance but want a slight edge in ignition quality without the cost of full iridium plugs.

Key features that stand out:
– Platinum Alloy Tip: Improved durability over standard plugs.
– Trivalent Metal Plating: Superior anti-corrosion and anti-seizing properties.
– Affordable Quality: NGK reliability at a friendly price point.

Pros:
– Highly respected manufacturer quality.
– Excellent value for money.
– Reliable performance for street driving.
Cons: Platinum plugs generally don’t last as long as iridium options.

Best for: Budget-conscious owners who prioritize NGK quality for routine replacement.

Expert Opinion: The BKR5EGP is a proven workhorse. While not a top-tier performance plug, its ignition efficiency and resistance to fouling make it a fantastic choice for standardized maintenance intervals.

KILOAUTO 4 Ignition Coils with 4 Iridium Spark Plugs fit for 2013-2014 for Scion for FR-S 2.0L H4,2013-2014 for Subaru for BRZ 2.0L H4 Ignition Coil Pack Replacement UF710, 22433AA651

KILOAUTO provides a comprehensive ignition kit specifically verified for the early model year FR-S (2013-2014). This kit includes Iridium spark plugs paired with high-quality coil packs. The focus here is on maximizing combustion efficiency to reduce energy loss, which directly translates to enhanced fuel efficiency and smoother operation. Replacing both components ensures you eliminate potential power dips caused by aging electronics.

Key features that stand out:
– Specific Early Model Fitment: Confirmed compatibility for 2013-2014 models.
– High Ignition Energy: Promotes better combustion and reduced energy loss.
– One-Year After-Sales Warranty: Provides confidence in the purchase.

Pros:
– Improves fuel economy and performance simultaneously.
– Reliable OE specification replacement.
– Excellent customer support and warranty coverage.
Cons: Long-term durability is slightly less proven compared to established brands like NGK.

Best for: Owners of 2013-2014 models needing a guaranteed fit and comprehensive coil/plug replacement.

Expert Opinion: For older FR-S models, replacing the entire ignition system is highly recommended. This kit offers reliable components that meet the necessary energy requirements for the FA20.

4 pc NGK Iridium IX Spark Plugs compatible with Scion tC 2.5L L4 2011-2016

Note: While this product is primarily listed for the Scion tC 2.5L L4, NGK Iridium IX plugs are often utilized by FR-S owners seeking slightly higher performance in specific heat ranges, but caution must be taken regarding specific heat range and gapping for the 2.0L H4 FA20 engine. Assuming the buyer selects the correct heat range variant for the FR-S, the Iridium IX is a performance benchmark. The ultra-fine electrode delivers superior performance and fast light-off.

Key features that stand out:
– Performance Iridium: Designed for the enthusiast who demands maximum performance.
– Fine-Wire Electrode: Highest efficiency spark for quicker acceleration.
– OE Quality: Backed by NGK’s reputation for precision manufacturing.

Pros:
– Outstanding performance characteristics.
– Exceptional acceleration response.
– Highly reliable under high boost or high compression.
Cons: Requires careful verification of the exact part number/heat range for the FR-S 2.0L.

Best for: Performance enthusiasts looking for race-proven spark plug technology (after ensuring correct part number).

Expert Opinion: Iridium IX plugs are often the go-to performance plug. They handle high cylinder pressures extremely well, but FR-S owners must ensure they choose the specific Iridium IX model designed for the FA20 engine code.

BDFHYK Ignition Coil UF333 & Spark Plug 7092 Compatible with Toyota Scion TC Camry Corolla Highlander Matrix RAV4 Solara Lexus HS250h Scion xB tC Pontiac Vibe 2.4L L4, Set of 4

Note: This specific product listing appears geared toward the 2.4L L4 Scion TC engine, which differs from the FR-S 2.0L H4 FA20 engine. While the brand BDFHYK offers components, this specific set is incompatible with the Scion FR-S 2.0L H4. However, we will review the quality of the set as a representative of the brand’s offerings, assuming they have an FR-S equivalent. This kit emphasizes robust construction using Japanese and German materials.

Key features that stand out:
– Premium Materials: Uses Japan-imported rubber and Germany-imported varnished wire for coils.
– Iridium Electrode and Unique Ceramic: Focused on quick starting and rapid acceleration.
– Long-Term Focus: Designed to fix common issues in high-mileage vehicles (over 80,000km).

Pros:
– Focus on high-quality coil materials for longevity.
– Excellent customer service and product development.
– Strong claims regarding restoration of performance in older cars.
Cons: Buyers must verify the specific part number compatible with the FR-S FA20 engine.

Best for: Those seeking an aftermarket brand focused on high-quality raw materials for their ignition system (upon finding the correct FA20 fitment).

Expert Opinion: Material quality is crucial in ignition components. BDFHYK’s commitment to high-grade imported materials suggests these components are built to withstand severe heat and electrical stress, making their FR-S-compatible offerings worth considering.

Comparison and Buying Insights

Choosing the best spark plugs for Scion FRS depends entirely on your usage and budget.

For simple maintenance and factory reliability, focus on the single iridium plug sets (Products 1, 2, or 3). They are engineered for maximum lifespan and stable performance in stock engines. If you occasionally push the engine hard, remember that the slightly cooler plug (Product 3) offers better detonation protection.

The greatest value comes from the combo kits (Torchbeam, FAERSI, KILOAUTO). If your FR-S is nearing the 80,000-mile mark, replacing the coils along with the plugs is a fantastic preventive measure, offering a complete ignition reset for long-term peace of mind. The Torchbeam and UF774 kits specifically offered Double Iridium, which generally guarantees the longest service interval—a crucial factor for drivers who hate performing maintenance.

If budget is the primary concern but you still want an upgrade over plain copper, the NGK G-Power Platinum plugs (Product 7) offer the best blend of price, quality, and durability among the single-plug options.

Final Verdict: Which Plugs Should You Choose?

Making the final decision on the best spark plugs for Scion FRS can be simplified by dividing our top picks into three categories:

The Daily Driver’s Choice (Best Reliability):
The Set of 4 Iridium Long Life Spark Plugs For Scion FR-S 2.0 H4 (Product 2) provides the optimal balance. They are pre-gapped, ensuring quick installation, and the fine-wire design guarantees efficient starting and reliable ignition throughout the normal RPM range.

The Performance Enthusiast’s Pick (Best Under Load):
If you plan on tuning your FR-S, running E85, or hitting the track frequently, you need consistency and a safeguard against high heat. While requiring careful fitment verification, the NGK Iridium IX (Product 9) is the industry standard for performance and high-stress applications in the FA20.

The Best Value Comprehensive Upgrade (Ignition System Overhaul):
For owners with 60,000+ miles who want to eliminate all current and potential ignition issues, the Torchbeam Set of 4 UF710 Ignition Coil Pack and Double Iridium Spark Plugs (Product 4) is the clear winner. This comprehensive kit provides superior double iridium plugs and brand-new coils, offering the longest service life of any option reviewed.

Best Spark Plugs For Scion FRS FAQ

What are the main benefits of using iridium plugs in the FA20 engine?

Iridium spark plugs offer three major benefits over standard nickel or copper plugs. First, they provide a much longer service life, often rated for 80,000 to 100,000 miles. Second, the fine iridium tip requires less voltage to fire, leading to a stronger, more consistent spark which improves combustion efficiency. Third, they are highly resistant to heat and wear, which is essential for the high compression and operating temperature of the Scion FR-S 2.0L engine.

How often should I replace the spark plugs on my Scion FR-S?

For the best performance and to ensure the longevity of your catalytic converter, it is generally recommended to replace the best spark plugs for Scion FRS every 60,000 miles if using long-life iridium plugs (which is standard for the FA20). If you have a heavily modified or tuned engine, performance iridium plugs should be checked and potentially replaced much sooner, sometimes every 30,000 miles, depending on the tune and boost levels.

Does the Scion FR-S 2.0L require a specific spark plug gap?

Yes, maintaining the correct plug gap is crucial for optimal ignition timing and performance. While factory specifications can vary slightly by year, the common gap requirement for the non-turbo FA20 engine is typically 0.030 to 0.032 inches (or 0.8 mm). If you are running forced induction (turbo or supercharger), you must consult your tuner, as the gap must often be reduced (tightened) to prevent the spark from blowing out under high boost pressure.

Are coil pack and spark plug replacement kits better than buying plugs individually?

For high-mileage Scion FR-S models (over 60,000 miles), purchasing a coil pack and spark plug kit (like those from Torchbeam or FAERSI) is often highly beneficial. Ignition coils degrade over time due to heat cycling and wear, leading to reduced voltage output. Replacing both components simultaneously ensures that the entire ignition system is fresh, resolving potential misfires and restoring peak performance more reliably than just swapping plugs alone.

Can using the wrong heat range plug damage my FA20 engine?

Yes, absolutely. Using a spark plug that is too hot (meaning it retains too much heat) can lead to pre-ignition or detonation, which severely damages pistons and cylinder walls in the high-compression FA20. Conversely, using a plug that is too cold can lead to spark plug fouling (carbon buildup), causing poor idle and misfires. Always ensure your replacement plugs match the OEM heat range unless specifically advised otherwise by a professional performance tuner.

How do I know if my current spark plugs are failing?

Common symptoms of failing best spark plugs for Scion FRS include a rough or erratic engine idle, difficulty starting the car (long crank time), noticeable reduction in acceleration and power, or a steady drop in fuel efficiency. The most obvious indicator is an engine misfire, which usually triggers the Check Engine Light (CEL) and stores a specific code (P030X codes).