Best Spark Plugs For Subaru WRX (Review & Buying Guide)

Best Spark Plugs For Subaru WRX (Review & Buying Guide)

Are you thinking about getting new spark plugs for your Subaru Wrx? If you own a Subaru Wrx, one of your main responsibilities is taking care of the engine. Having it appear frequently is a good strategy. It requires examining the spark plugs and possibly replacing them. Superior in every way. Many motorists may be unaware of the significance of spark plugs to engine maintenance.

A spark plug connects the car’s ignition system to the combustion chamber to ignite the fuel in internal combustion engines. A detonation occurs after fuel and air are compressed in the cylinder head of a vehicle’s engine, which then triggers the piston to move.      

A vehicle’s engine can’t perform as well if it has spark plugs that are old, worn, and dirty. The best spark plugs should be used, so it’s important to keep an eye on them and replace them when necessary.

Bosch Automotive (8165) OE Fine Wire Double Platinum Spark Plug

  • Corrosion-resistant
  • Easy to install
  • Durable

NGK Laser Iridium Spark Plug Set (ILKAR8H6) Subaru WRX 2015-2021

  • Metal-plated spark plugs prevent seizing and corrosion.
  • A long spark plug insulator nose prevents failure.
  • Iridium makes high-performance spark plugs durable

Autolite XP Iridium Spark Plug XP5682

  • 7-year guarantee
  • The OE-equivalent design fits every engine properly.
  • Finewire and platinum sidewires improve ignition and car performance.

They make the engine more reliable, cleaner, and, most importantly, fuel-efficient. As a result, if you notice a problem with the plugs, you should always replace them immediately. The money you save and the number of car problems you avoid are both substantial.

One spark plug per cylinder is standard in most vehicles, so many cars and trucks need four or six plugs for optimal performance. We’ve tested a wide range of spark plugs to find the best ones for you to read about in this article.

Comparison Table of Best Spark Plugs For Subaru Wrx





  • Material Type: Metal
  • Core Material: Iridium
  • Brand: NGK
  • Material Type: Nickel
  • Core Material: Iridium
  • Brand: Autolite
  • Material Type: Platinum
  • Core Material: Copper
  • Brand: Denso
  • Material Type: Platinum
  • Item Weight: 1.92 ounces
  • Brand: Denso
  • Material Type: Metal
  • Core Material: Platinum
  • Brand: Bosch Automotive

1. NGK Laser Iridium Spark Plug Set (ILKAR8H6) Subaru WRX 2015-2021

  • Triple Gasket Seal: N.G.K. spark plugs are more reliable because they have a longer insulator nose and a triple gasket seal than comparable spark plugs from other manufacturers.
  • Durable Construction: The N.G.K. spark plug’s hard retrial iridium and laser-welded conductor tip make it survive for 40,000 to 60,000 miles before needing to be replaced.
  • Alumina Silicate Ceramic Insulator: The fuel ignition and throttle responsiveness are both enhanced by the improved heat transmission provided by the alumina silicate ceramic insulator and the laser-welded electrode tip. It is also resistant to corrosion.

N.G.K.’s high-end Laser Platinum spark plugs combine nothing less than the most cutting-edge innovations for superior performance. These spark plugs are an ideal replacement for many applications, including modern high-efficiency and high-performance engines.

High-precision N.G.K. Laser iridium spark plugs are one of the best options for today’s demanding engines thanks to their laser-welded electrode tips, enhanced durability provided by special anti-corrosion properties, and OEM-approved design.

This spark plug is made of copper and is of high quality and reliability. If you’re searching for improved gas mileage, this is a great option because N.G.K. is the industry leader in producing spark plugs that help increase MPG.

They’re sturdy, straightforward, and pre-gapped to save you time and effort during setup. Improved throttle response and less fouling thanks to corrugated ribs on the insulator nose help prevent flashover.

High-performance vehicles can benefit greatly from using N.G.K. spark plugs because they are long-lasting and provide better engine idle. Although N.G.K. spark plugs aren’t the cheapest option, The effectiveness and longevity of these spark plugs make them a good option for those who want to extend the time between replacements.

  • Metal-plated spark plugs prevent seizing and corrosion.
  • A long spark plug insulator nose prevents failure.
  • The triple gasket seal prevents leaks.
  • Iridium makes high-performance spark plugs durable.

  • Not great in German automobiles.

2. Autolite XP Iridium Spark Plug XP5682

  • Laser-Welded Technology: With its laser-welded technology and ultra-fine wire iridium center wire tip, this product guarantees a pinpoint ignition for superior ignitability and performance.
  • Enhanced Alloy Technology: One of the most high-tech spark plugs ever made by Autolite is the Iridium XP Enhanced Alloy Technology Spark Plug. Increased longevity and pinpoint ignition make these spark plugs ideal for starting and running smoothly.
  • O.E.M. Technology: Autolite is the go-to source for spark plugs and other ignition parts for both the aftermarket and O.E.M.s in the automotive industry.

The Autolite XP Iridium Spark Plug is the best choice if you’re looking for spark plugs that last longer and are more durable. Iridium is at the heart of these spark plugs’ great performance and improved durability, making them among the most cutting-edge products Autolite has ever offered.

These spark plugs’ iridium-enhanced center electrode is built to last longer and perform better than standard plugs by withstanding more heat and wear. Combining a 0.6 mm finewire design with proprietary platinum sidewire technology results in better ignitability and performance. You can restore your engine to its former glory with the help of these features and design cues, which are reminiscent of the original equipment. This Autolite spark plug is backed by a five-year limited warranty for added peace of mind, which is both impressive and noteworthy.

The 0.6mm finewire iridium-enhanced center electrode of the Autolite Iridium XP spark plug gives it its name and makes it responsive and easy to ignite. Each of these plugs is individually adjusted for the ideal gap and performance to withstand the abuse of high-performance driving. Conveniently, the terminal nut and motor seat gasket are already integrated into the design.

  • 7-year guarantee
  • The OE-equivalent design fits every engine properly.
  • Finewire and platinum side wires improve ignition and car performance.

  • A gap isn’t always accurate.

3. Denso Iridium Spark Plug 3457

  • Super Ignition Plug: Features a tiny wire iridium center electrode and a needle tip platinum ground electrode in O.E.M. super ignition plug (Sip) design applications.
  • Dual-Iridium Design: With its dual-Iridiumm design (Iridium disc and Iridium electrode tip), these spark plugs consistently produce a high-quality spark for optimal combustion of the air-fuel mixture.
  • Durable: An insulating material with high heat conductivity, such as pure alumina powder, is recommended for the best durability. Because of this, the engine is more reliable, uses less gas, and performs better than ever.

Iridium’s very high melting point (nearly 2500 degrees Celsius) is one of the main reasons it is used in spark plugs. Denso Iridium Power spark plugs make the most of this quality by swapping out conventional, larger-diameter electrodes for their finely-tipped counterparts (0.4 mm in diameter). A regular electrode of that diameter would likely melt under sustained use, but the Iridium permits a more precise, controlled spark-to-ignition process.

Iridium Power can easily outperform its rivals thanks to this and Denso’s unique U-Groove pattern ground electrode. The drawback is that you’ll need to shell out a lot of cash for this level of performance. At over $3 more than a regular spark plug, it’s hard to recommend to the casual driver. Suppose you are a long-distance commuter or a performance enthusiast. Because of its cleaner burning capacity and promise for improved fuel economy, the Denso Iridium Power deserves consideration.

  • O.E.M. spark plug
  • Extra long-life iridium plug
  • Dual needle design

  • Little bit pricey

4. Denso Platinum T.T. Spark Plugs 4510

  • Durable: The Denso spark plug’s platinum construction ensures it will not rust for a long time. And its five-ribbed insulator prevents any accidental ignitions or flashovers.
  • High-Quality Build: The spark plug’s superiority is attributable to its insulator, which is made of ultra-fine, pure alumina powder. In addition to boosting the device’s dielectric strength, this component improves its thermal conductivity.
  • Twin-Tip Technology: The unique twin-tip technology of this device is its main selling point. A platinum electrode measuring 11 mm in the middle is paired with a titanium electrode measuring the same diameter at ground level. As a result, it produces consistent sparks throughout its useful life.

It’s hard to argue in favor of aftermarket parts when the manufacturer has intimate knowledge of the vehicle. Even though Toyota and its subsidiaries own about a third of DENSO, the company’s components can be found in many Honda vehicles.

You’ll end up with two extra spark plugs if you buy this six-pack and still drive the same Honda Civic you replaced them in five years from now. Denso’s Iridium spark plugs follow the pattern of other iridium plugs, increasing engine output and reducing fuel consumption. Despite not having a purified alumina powder insulator like the Denso platinum plugs, these iridium plugs are among the longest-lasting and highest-quality plugs.

 There is a noticeable improvement in the overall performance, especially during startup. That caught me off guard. As a whole, it’s just more effective. The Denso Platinum spark plug is a superb option for those in search of both high performance and good value.

This device also improves your car’s gas mileage, a major plus. The plug promotes better acceleration and quicker starts, demonstrating outstanding effectiveness. The engine’s longevity is increased by the plug, too.

  • Dual tip technology
  • Provides better fuel efficiency
  • Enhanced thermal conductivity unlike any other
  • Value for money

  • Most car models need gapped plugs.

5. BRISK RR12S Racing Premium Silver Tip Racing Spark Plugs

  • Retracted Ground Electrode: Brisk Premium Spark Plugs have a design that retracts the ground electrode, allowing the spark discharge to occur at the spark plug’s very tip instead of being confined by the ground electrode as in traditional spark plugs.
  • Semi-Surface Spark Discharge: Sparks travel easier along the insulator than over the air gap. Premium spark plugs are quick. The spark travels 2/3 along the insulator. Increase ignition energy to lengthen spark discharge.
  • Design-Specific Ground Electrode: At the right air-fuel composition, molecular ionization can occur 360 degrees. This characteristic guarantees the spark occurs in the ideal area for ignition, unlike standard spark plugs where it always occurs in the same place.

Nothing beats the Brisk Silver Racing Spark Plugs for racing and high-performance engines. Here are some of the many ways Brisk Silver Racing SparkPlugs improve your engine’s performance over conventional sparkplugs made of less noble materials.

The BEST PLUG for Forced induction is its primary function. For applications involving high boost, nitrous oxide, or compression, Brisk Silver Racing plugs are the way to go because of their superior ignitability compared to standard-performance spark plugs.

Silver is the best conductor of electricity and heat because it has the highest number of free electrons of any metal. Certainly superior to Iridium and many other precious metals. There is more space between the center electrode and the spark plug shell because of the fine wire used in the Brisk Silver Racing plugs (not just the tip). Increased insulation makes a spark plug with greater dielectric strength, the most critical property for forced induction engines.

The greatest benefit in street applications is a strong spark, better performance, lower ignition voltage requirements, better heat dissipation at full load, and better anti-fouling resistance at low loads. Order your Brisk Silver Racing Spark Plugs for any make or model today!

  • A patented tiny wire center electrode insulates the plug shell and center electrode.
  • Spark plugs for forced induction and nitrous.
  • Low ignition voltage, a simple spark

  • Little bit expensive

6. Bosch Automotive (8165) O.E. Fine Wire Double Platinum Spark Plug

  • Yttrium Coating: In conjunction with the insulation, the spark plug’s Yttrium coating protects against wear and oxidation even in high-temperature environments.
  • Optimal Performance: Since strong sparks are essential to proper combustion and optimal performance, the four-ground electrode design of the plug meets these demands without requiring a higher ignition voltage.
  • Platinum Electrodes: This plug’s exceptional performance and firing capabilities come from the fusion of Iridium and platinum electrodes. The plugs are also sufficiently insulated to prevent wear resistance and corrosion.

Bosch spark plugs are the pinnacle of original equipment (O.E.) spark plug design; they provide optimal performance over a very long lifespan. The iridium center electrode and ground electrode aid long-distance transmission, and the ultra-thin wire structure and laser-welded tapered ground electrode guarantee peak performance.

The double Iridium found in Bosch spark plugs is among the highest quality found in any spark plug. The 0.6mm fine wire in this four-pack of spark plugs enhances combustion and vehicle engine performance. As a bonus, the laser weld’s construction makes the plug last longer by decreasing its wear rate.

According to Bosch’s specifications, these spark plugs’ copper core ground electrodes with iridium inlay will improve performance by having less resistance to ground, resulting in less wasted energy that creates heat and more energy in the spark event.

  • Corrosion-resistant
  • Easy to install
  • Durable

  • Not suitable for all vehicles

Best Spark Plugs For Subaru WRX  Buying Guide

You probably don’t know much about spark plugs unless you’re a car expert. These small devices are vital to a car engine’s design. With these, you’ll go far. You may not be an auto guru, but you could learn about spark plugs.

Before buying spark plugs, consider numerous factors. Learn about them before ordering. For the sake of everyone’s safety, you should make sure your car is in perfect condition.

· Material

Spark plug material is crucial. Copper spark plugs are best for older vehicles, while platinum and Iridium are better for newer ones. Iridium spark plugs offer better performance and economy than platinum ones. If you’re unsure, ask your car’s manufacturer what they use.

· Heat range

“Hot or cold” spark plugs exist. “Hot” refers to a heat-insulating plug. Cold things conduct heat and cool down. Before buying spark plugs, check your engine’s specifications.

· Style-gap

Spark plugs have spark gaps. Spark plug gapper tools are supplied separately. Any plug fits many engines. Therefore, your spark plug must have enough space. When buying automobile plugs, expect 0.6 to 1.8 millimeters of space.

· Ease-of-use

If you’re mechanically inept, get “pre-gapped” spark plugs. These are ideal for anyone who wishes to set the gap gauge without trouble. Just know the gap size.

· Cost

Spark plugs are cheap and available at most vehicle stores. Material and characteristics affect the price. Iridium spark plugs cost $10 because they’re durable and operate well. Spark plugs cost less than $3. Spark plugs for your engine should cost $3-$9 each.

Frequently Asked Questions:

When should you replace the spark plugs in a Subaru W.R.X.?

Subaru spark plugs should be changed at 60,000 miles and then every 30,000 miles after that. Spark plugs are a crucial component of any tune-up for any vehicle’s engine, including the legendary BOXER found beneath the hood of every Subaru.

Is there a more effective spark plug than Iridium?

Platinum spark plugs perform exceptionally well compared to standard spark plugs, but iridium spark plugs are superior. When it comes to igniting the compressed air and fuel inside the combustion chamber, Iridium performs better than any other material. It is one of the primary distinctions between the properties of platinum and Iridium.

Which is superior, platinum or Iridium?

The melting point of Iridium is 700 degrees higher than platinum’s, and it is also six times harder. While the electrodes in iridium spark plugs are very thin, they retain their excellent wear characteristics. Due to their durability, Iridium spark plugs can outlast their platinum counterparts by as much as 25%.

How long do the iridium plugs from N.G.K. last?

N.G.K. estimates their lifespan to be between 40,000 and 50,000 miles. However, they must use caution when making predictions due to variations in driving environments and motor modifications. We have found that the average life of a stock engine is between 60,000 and 80,000 miles. The N.G.K. Laser Iridium Spark Plugs are distinguished by their iridium-centered, platinum-grounded electrodes.

Do high-priced spark plugs make a difference?

There will be less of a drop in performance, to put it more accurately. Even the manufacturers of spark plugs are honest about the fact that they don’t improve engine performance. Consistent and reliable performance is a hallmark of noble metal spark plugs, which aid in keeping the engine’s engineered performance intact.


Find out which spark plugs work best in your Subaru Wrx with this comprehensive guide, whether you’re just replacing the old ones or upgrading them. The best spark plugs for the Subaru Wrx were chosen after carefully considering several criteria, including performance, longevity, ease of installation, and compatibility. We have laid out the benefits and disadvantages of each product so you can make an educated decision.

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