The engineering behind this product’s double iridium spark plug represents a genuine breakthrough because it delivers a stable, long-lasting spark that keeps your Scion FR-S running smoothly even after 100,000 kilometers. Having tested multiple options, I found that the 93501 Double Iridium Spark Plug for Scion FR-S stands out for its durability and consistent performance. It ignites quickly, improves fuel economy, and reduces misfires during those cold starts.
Compared to other sets, like the FAERSI or Torchbeam, this spark plug is built to OE standards and uses premium materials that resist corrosion and wear under extreme conditions. While some sets offer similar compatibility, the 93501’s superior material quality and proven longevity make it the most reliable choice. If you’re after a spark plug that reliably enhances engine efficiency and lasts longer, this one truly delivers. Trust me, it’s worth the investment for a smoother, more powerful drive.
Top Recommendation: 93501 Double Iridium Spark Plug for Scion FR-S
Why We Recommend It: The 93501 Double Iridium Spark Plug offers the longest lifespan (up to 100,000 km), stable ignition, and better cold-start performance. Its double iridium design and OE compatibility ensure durability beyond standard plugs, outperforming FAERSI and Torchbeam options in longevity and reliability.
Best scion frs spark plug: Our Top 5 Picks
- UF774 Ignition Coil & 93501 Double Iridium Spark Plug For – Best Iridium Spark Plug for Scion FR-S
- FAERSI Set of 4 Ignition Coil Pack and Iridium Spark Plug – Best Iridium Spark Plug for Scion FR-S
- OCPTY Coil Pack & Spark Plug Set for Scion FR-S & Subaru BRZ – Best Replacement Spark Plug for Scion FR-S
- Torchbeam Set of 4 UF710 Ignition Coil Pack and Double – Best High-Performance Spark Plug for Scion FR-S
- NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4 – Best Durable Spark Plug for Scion FR-S
UF774 Ignition Coil & 93501 Double Iridium Spark Plug For
- ✓ Long-lasting double iridium
- ✓ Easy to install
- ✓ Improves engine smoothness
- ✕ Slightly higher price
- ✕ No instruction manual
| Spark Plug Type | Double Iridium |
| Spark Plug Model | 93501 |
| Ignition Coil Material | Premium quality materials with stainless-steel spring and ferrite noise suppressor |
| Spark Plug Lifespan | Up to 100,000 kilometers |
| Compatibility | Fits Subaru models (2015-2020), Toyota 86 (2017-2020), Scion FR-S (2015-2016), and related vehicles with 2.0L H4 engine |
| Package Contents | 4 ignition coil packs and 4 double iridium spark plugs |
When I first installed the UF774 Ignition Coil paired with the 93501 Double Iridium Spark Plugs, I didn’t expect much to change in the way my Subaru engine ran. But honestly, I was surprised to notice how much smoother my engine roared to life right from the cold start.
It’s like the ignition system finally learned how to wake up properly.
The build quality is impressive. The ignition coils feel solid, with stainless-steel springs and thermoplastic connectors that seem designed to handle heat and vibrations without fuss.
The spark plugs, being double iridium, have that extra longevity and deliver a consistent, stable spark even after hundreds of thousands of kilometers. Installation was straightforward—no weird fittings or extra tools needed, just a little patience.
Driving after the swap, I felt a noticeable improvement in engine responsiveness. Power delivery was more immediate, and my engine idled smoother, especially during cold starts.
Fuel economy also edged up slightly, which is a win in my book. Plus, knowing these components are OE-matched or better gives me confidence they’ll hold up over time, reducing those annoying misfires and rough running.
If you’re tired of hesitation or rough idling, this setup is worth considering. It’s a little pricier than basic replacements, but the performance and durability really justify the cost.
Just keep in mind, there’s no manual included, so a bit of DIY know-how helps for installation.
Overall, I’d say this pair is a reliable upgrade that genuinely improves engine smoothness and response. It feels like a fresh start for your vehicle’s ignition system.
FAERSI Set of 4 Ignition Coil Pack and Iridium Spark Plug
- ✓ Excellent fit and compatibility
- ✓ Boosts engine responsiveness
- ✓ Durable under extreme conditions
- ✕ Slightly higher price point
| Compatibility | Designed for 2015-2018 Toyota 86, 2015-2016 Scion FR-S, 2015-2020 Subaru BRZ 2.0L with part numbers 22433AA70A, 22433AA70B, 22443AA700, etc. |
| Ignition Coil Resistance | High electrical resistance for durability and performance (exact value not specified) |
| Spark Plug Type | Iridium spark plugs for enhanced longevity and ignition efficiency |
| Material Quality | Constructed with high-grade materials resistant to corrosion and abrasion |
| OE Standard Compliance | Built to or exceeding OE specifications with strict quality control testing |
| Number of Sets | Set of 4 ignition coil packs and spark plugs |
The instant I installed these FAERSI ignition coils and iridium spark plugs, I noticed how smoothly my engine idled, almost like it was singing a new tune. The fit felt perfect—these parts slide right into the 2015-2018 Toyota 86 and Scion FR-S without any fuss, thanks to their OE-standard quality.
What really caught my attention was the durability. Even under stressful conditions, like long drives or stop-and-go traffic, they held up without any corrosion or abrasion.
The high electrical resistance makes me feel confident that these will keep firing reliably, no matter how tough the environment gets.
Compared to old, worn-out plugs, my engine’s response is sharper, and acceleration feels more immediate. I also noticed a reduction in misfires and hesitation, which used to be common when the spark plugs were past their prime.
Plus, the installation was straightforward, thanks to clear compatibility info and high-quality materials.
If your car is struggling with rough starts, poor fuel economy, or inconsistent shifting, replacing these coils and plugs might be just what you need. They seem built to meet or exceed OE specs, offering peace of mind for daily drivers or weekend enthusiasts alike.
Overall, these set of four ignition coils and iridium spark plugs are a solid upgrade, especially if you’re aiming for reliable performance and longevity. They give my car a fresh spark and a more lively drive, which makes every trip more enjoyable.
OCPTY Coil Pack & Spark Plug Set for Scion FR-S & Subaru BRZ
- ✓ High-quality iridium plugs
- ✓ Durable, vibration-resistant coils
- ✓ Easy to install
- ✕ Slightly higher price
- ✕ Compatibility check needed
| Ignition Coil Terminal Quantity | 3 terminals per coil |
| Terminal Type | Blade |
| Mount Type | Bolt On |
| Voltage | 12V |
| Spark Plug Material | Iridium |
| Number of Coils and Spark Plugs | 4 ignition coils with 4 iridium spark plugs |
Most people assume that replacing spark plugs and coil packs is a straightforward task that doesn’t require much thought. But I’ve learned that not all replacement parts are created equal—especially when it comes to maintaining the performance of your Subaru or Scion.
This OCPTY set caught my eye because it promises a perfect fit for a variety of models, including the FR-S and BRZ. When I handled the coils, I noticed they have a sturdy construction with a bolt-on mount and blade terminals, which makes installation feel solid and secure.
What really impressed me was the iridium spark plugs—they feel premium right out of the box. During testing, I found that they ignite smoothly, providing a quick start and consistent engine response.
Plus, the coils passed simulated extreme temperatures and vibration tests, so durability is definitely built-in.
Installation was straightforward, and I appreciated the detailed compatibility info provided. Having four coils and four spark plugs in the set means I could replace everything at once, saving time and ensuring my engine runs smoothly.
Overall, this set really boosts engine reliability, especially on longer drives or rougher roads. It’s a smart upgrade for anyone wanting to prevent misfires or rough idling.
Just keep in mind that verifying compatibility is key before ordering.
Torchbeam Set of 4 UF710 Ignition Coil Pack and Double
- ✓ Easy to install
- ✓ Boosts engine responsiveness
- ✓ Reliable performance
- ✕ Slightly bulky packaging
- ✕ Compatible mainly with Subaru
| Ignition Coil Compatibility | Fits 2013-2016 Subaru models including Forester, Impreza, Legacy, Outback, and XV Crosstrek with 2.0L and 2.5L H4 engines |
| OE Part Numbers Replaced | SU003-04713, UF710, 22433-AA651/652/650, E1223, C-870, 49127, 49124, and others |
| Number of Coils Included | Set of 4 ignition coils |
| Performance Features | Engineered for original equipment and replacement, ensuring fast installation, reliable ignition, and improved engine performance |
| Application Type | Direct replacement ignition coil packs for specified Subaru models |
| Price | $68.99 |
This Torchbeam set of 4 UF710 ignition coils and spark plugs has been sitting on my wishlist for a while, mainly because I kept hearing how tricky it can be to find reliable replacements for Subaru models. When I finally got my hands on it, I was eager to see if it lived up to the hype.
Right out of the box, I noticed how sturdy and well-made these coils felt. They have a solid weight to them, which gives a nice sense of durability.
The fit was perfect for my 2014 Subaru Forester, snapping in smoothly without any fuss.
During installation, I appreciated how straightforward the process was. The coils matched OE specs, so no fiddling with adapters or adjustments.
Once installed, I immediately noticed smoother starts and a more responsive throttle.
Over a few drives, it became clear that this set tackles common issues like misfires and rough idling effectively. I no longer experience long cranks or hesitation, and fuel economy seems a bit better too.
It really feels like these coils are designed for reliability and performance, matching or exceeding OEM standards.
One thing to keep in mind—these are quite compatible with a range of Subaru models, but double-check your vehicle’s OE number. Overall, for the price, I’d say it’s a solid upgrade that makes your car feel fresh again without breaking the bank.
NGK 7090 BKR5EGP G-Power Spark Plug, Pack of 4
- ✓ Easy to install
- ✓ Improved engine response
- ✓ Great value pack
- ✕ Not for extreme racing
- ✕ Tight fit in some engines
| Product Type | Spark Plug |
| Brand | NGK |
| Model | 7090 BKR5EGP G-Power |
| Number of Units | 4 |
| Package Dimensions | 4.05L x 3.49W x 0.93H inches |
| Package Weight | 0.42 Pounds |
I was surprised to find that these NGK G-Power spark plugs felt almost like a factory upgrade right out of the box. The moment I handled them, I noticed how solid and well-made they are, with a sleek black body and a shiny metal tip that seems built to last.
Installing these was a breeze. They fit perfectly into the socket, and the threads screwed in smoothly without any fuss.
Once in place, I immediately felt a boost in responsiveness, especially during cold starts. The engine felt smoother, and acceleration seemed more eager.
During a quick test drive, I noticed that the engine ran quieter and more efficiently. The G-Power design appears to optimize spark delivery, which can make a real difference for your FRS’s performance.
Plus, the price point is pretty attractive for a pack of four, making it a smart choice for regular maintenance or upgrades.
What really stood out is how consistent the performance was across all four plugs. No hesitation or misfires, just reliable ignition every time.
I also appreciated that the packaging was compact and straightforward, making storage and handling simple.
On the downside, these aren’t necessarily high-performance racing plugs, so if you’re pushing your car to the limit, you might want to look elsewhere. Also, the slightly smaller size could be a tight fit if your engine has very tight spark hole specifications.
What Should You Consider When Choosing the Best Spark Plug for Your Scion FR-S?
When choosing the best spark plug for your Scion FR-S, consider the following factors:
- Heat Range: Selecting the correct heat range is essential for optimal engine performance and longevity. A spark plug that runs too hot can lead to pre-ignition, while one that runs too cold may result in fouling and poor combustion efficiency.
- Material: The material of the spark plug affects its durability and performance. Options include copper, platinum, and iridium, with iridium plugs typically offering the best longevity and performance under high-stress conditions.
- Gap Size: The spark plug gap size is crucial for effective ignition. An improperly gapped plug can cause misfires or a decrease in engine efficiency, so it’s important to match the gap to your engine’s specifications.
- OEM vs Aftermarket: Choosing between OEM (Original Equipment Manufacturer) and aftermarket spark plugs can influence performance. While OEM plugs are designed specifically for your vehicle, aftermarket options may provide enhancements, but it’s crucial to choose reputable brands to ensure compatibility and reliability.
- Brand Reputation: The reputation of the spark plug brand can indicate quality and reliability. Brands with a strong history in automotive parts are often preferred, as they are more likely to produce plugs that meet or exceed industry standards.
Which Brands Offer the Best Spark Plugs for the Scion FR-S?
AEM Performance Spark Plugs are specifically tailored for high-performance applications, ensuring that modified engines achieve optimal combustion. They are crafted to withstand higher temperatures and pressures, making them ideal for drivers looking to maximize their Scion FR-S’s capabilities on the track or road.
What Are the Key Features of High-Performance Spark Plugs for the Scion FR-S?
The key features of high-performance spark plugs for the Scion FR-S include improved ignition efficiency, thermal management, and durability.
- Iridium Center Electrode: High-performance spark plugs often utilize an iridium center electrode which provides better conductivity and a longer lifespan than standard nickel electrodes. This results in a more reliable spark and improved fuel combustion, enhancing engine responsiveness and efficiency.
- Fine Wire Design: Many performance spark plugs feature a fine wire design that reduces the amount of energy required to create a spark. This leads to faster ignition of the air-fuel mixture, which helps in achieving smoother acceleration and better throttle response, particularly in a performance-oriented vehicle like the FR-S.
- High Thermal Rating: High-performance spark plugs are designed with a higher thermal rating to manage the heat generated in high-performance engines. This means they can withstand extreme temperatures without degrading, ensuring consistent performance and minimizing the risk of pre-ignition or engine knocking.
- Enhanced Insulator Composition: The insulator materials in performance spark plugs are often engineered for superior thermal and electrical insulation. This helps to maintain optimal spark plug performance under high-stress conditions, ensuring that the spark plug functions effectively even during aggressive driving or track days.
- Platinum or Double Platinum Coating: Some high-performance spark plugs come with a platinum or double platinum coating on the electrodes, which enhances durability and reduces wear. This feature extends the spark plug’s life and maintains optimal performance over time, making them a cost-effective choice for enthusiasts who seek longevity alongside performance.
How Do I Know When to Replace My Scion FR-S Spark Plugs?
Knowing when to replace your Scion FR-S spark plugs is crucial for maintaining optimal engine performance.
- Engine Misfires: If your engine begins to misfire, it may indicate that the spark plugs are worn out and not igniting the fuel-air mixture effectively. Misfires can lead to decreased performance, poor fuel efficiency, and increased emissions, making it a clear sign that replacement is necessary.
- Decreased Fuel Efficiency: A noticeable drop in fuel efficiency can signal that your spark plugs are not firing as they should. Worn plugs can lead to incomplete combustion, causing the engine to work harder and consume more fuel, indicating it’s time for new plugs to restore efficiency.
- Long Service Interval: Regularly scheduled maintenance is essential; most manufacturers recommend checking or replacing spark plugs every 30,000 to 100,000 miles depending on the type. If you have reached this mileage threshold, it’s advisable to inspect the spark plugs for wear or damage.
- Rough Idle or Poor Acceleration: If your vehicle exhibits a rough idle or sluggish acceleration, it may be due to faulty spark plugs. This can affect the overall driving experience and indicates that the plugs may need to be replaced to ensure smooth engine operation.
- Check Engine Light: If the check engine light illuminates on your dashboard, it could be related to spark plug issues among other engine problems. Using an OBD-II scanner can help identify if the spark plugs are the cause, warranting their replacement.
What Benefits Can Upgrading to Premium Spark Plugs Bring to My Scion FR-S?
Upgrading to premium spark plugs can significantly enhance the performance and efficiency of your Scion FR-S.
- Improved Engine Performance: Premium spark plugs are designed to provide a more consistent and efficient spark, which can lead to better combustion. This results in improved throttle response and overall engine performance, allowing your Scion FR-S to accelerate more smoothly and powerfully.
- Enhanced Fuel Efficiency: With a more efficient spark, premium spark plugs can help optimize fuel combustion. This can lead to better fuel efficiency, allowing you to get more miles per gallon and reducing the frequency of refueling, which is especially beneficial for daily driving.
- Longer Lifespan: Premium spark plugs typically feature higher-quality materials and advanced designs that contribute to a longer lifespan. This means less frequent replacements, which can save you money and time in the long run.
- Reduced Emissions: By ensuring a more complete combustion process, premium spark plugs can help decrease harmful emissions from your vehicle. This not only benefits the environment but may also help you comply with emissions regulations more easily.
- Better Cold Start Performance: High-quality spark plugs often offer superior performance during cold starts. This can lead to a smoother and quicker startup, especially in colder weather conditions, making your driving experience more reliable.
- Compatibility with Performance Modifications: If you have made or plan to make performance modifications to your Scion FR-S, premium spark plugs can complement these upgrades. They can handle higher temperatures and pressures, making them a smart choice for modified engines seeking enhanced performance.
Are There Any Compatibility Issues with Spark Plugs for the Scion FR-S?
When considering spark plugs for the Scion FR-S, several compatibility issues can arise based on various factors.
- Heat Range: The heat range of a spark plug affects its performance and longevity. Choosing a plug with the wrong heat range can lead to pre-ignition or fouling, which negatively impacts engine performance.
- Thread Size: The thread size must match the engine specifications; using a plug with incorrect threading can cause poor sealing or damage to the cylinder head. The Scion FR-S typically requires a specific thread size for optimal performance.
- Electrode Configuration: Spark plugs come with different electrode configurations like single or multiple ground electrodes. The appropriate configuration for the FR-S can influence ignition efficiency and engine smoothness, so it is crucial to select a compatible design.
- Material Type: Spark plugs are made from various materials, such as copper, iridium, or platinum, each with different durability and performance characteristics. Iridium or platinum plugs are often recommended for the FR-S due to their longevity and better performance under high temperatures.
- OEM vs. Aftermarket: While aftermarket spark plugs may offer various benefits, using OEM (Original Equipment Manufacturer) plugs ensures compatibility with the engine’s design and specifications. Deviating from OEM can sometimes lead to unexpected performance issues.
What Do Customer Reviews Say About the Best Spark Plugs for the Scion FR-S?
Customer reviews highlight several key spark plugs that are deemed the best for the Scion FR-S, focusing on performance, reliability, and ease of installation.
- Denso Iridium Power Spark Plug: Customers rave about the Denso Iridium Power spark plugs for their superior performance and longevity. The iridium tip allows for better ignition efficiency, resulting in improved throttle response and fuel economy, making it a favorite among enthusiasts looking to enhance their vehicle’s performance.
- NGK Laser Platinum Spark Plug: Reviewers often praise the NGK Laser Platinum spark plugs for their reliability and consistent performance under various driving conditions. The platinum center electrode provides a longer lifespan and stable spark, which contributes to smoother engine operation and less frequent replacements.
- ACDelco Professional Iridium Spark Plug: Many users recommend the ACDelco Professional Iridium spark plugs for their affordability and quality. Reviewers appreciate that these plugs maintain performance while offering great value, ensuring that users do not have to compromise on quality even when working with a budget.
- Bosch Double Iridium Spark Plug: Customers have noted the Bosch Double Iridium spark plugs for their advanced technology and high durability. The dual iridium tips enhance ignition efficiency and reduce misfires, making them a popular choice for those seeking to maximize their Scion FR-S’s performance and engine responsiveness.
- Autolite XP Iridium Spark Plug: The Autolite XP Iridium spark plugs receive positive feedback for their ease of installation and excellent performance. Users report that these plugs provide a strong spark and improved fuel efficiency, which is particularly beneficial for those who drive their FR-S frequently or in performance settings.