Buyer's Guide & Information

Best Spark Plugs For Horsepower Reviewed

To find the best spark plugs for horsepower, you must evaluate the top brands. Do spark plugs add horsepower? Find out in this review guide.

An automotive spark plug delivers an electric current from the vehicle’s ignition system to the combustion chamber. Its job is to ignite the compressed fuel/air mixture.

To find the best spark plugs for horsepower, you must evaluate the top brands. Do spark plugs add horsepower? We look at the information to get an answer and find models that increase power.

Preview

Product

Core Material

Plug Type/Number

Gap Size

Check Price

NGK BKR5EIX-11 Iridium IX Spark Plug

NGK BKR5EIX-11 Iridium IX

Iridium

BKR5EIX-11

.044"

Bosch 9620 Double Iridium Pin to Pin Spark...

Bosch 9620

Iridium

9620

.040"

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

NGK 7090 BKR5EGP G-Power

Platinum

7090 BKR5EGP

.039"

NGK IZFR5K-11 Laser Iridium Spark Plug

NGK IZFR5K-11 Laser Iridium

Iridium

IZFR5K-11

.044"

Briggs & Stratton 796112-2pk Spark Plug (2...

Briggs & Stratton 796112-2pk

Copper

796112 (J19LM, RJ19LM, 802592, 5095K)

.030"

Autolite AR3910X Racing Spark Plug

Autolite AR3910X

Yttrium-enhanced alloy

AR3910X

.030"

ACCEL 8199 U-Groove Spark Plug - 8 Pack of...

ACCEL 8199 U-Groove

Copper

AR3910X

.032"

ACDelco -12680072 41-110 Professional Iridium...

ACDelco -12680072 41-110

Iridium

41-110

.040"


Why Better Spark Plugs Increase Horsepower

Do better spark plugs increase horsepower? Yes, especially if the new spark plugs replace old, deteriorated ones. As the spark plug begins to break down, the vehicle has more trouble accelerating.

With iridium spark plugs, you can make the most out of your vehicle’s horsepower by creating a more efficient combustion process. This simple replacement allows for a more rapid reaction every time you step on the gas pedal.


Choosing Spark Plugs for Better Horsepower Performance

Vehicle Compatibility

You aren’t going to buy a Craftsman 6.5 horsepower lawn mower spark plug for your pickup truck. The first consideration you must make when looking for new spark plugs is compatibility. The plugs must work with your make/model/year vehicle. Additionally, you will need a spark plug for each cylinder.

Spark Plug Type & Coating

Which spark plug is better – iridium or platinum? Platinum plugs are an upgrade from the standard copper models. They can last up to 100,000 miles and work well with distributor-based systems. However, iridium is another step up and considered the best on the market. Do iridium spark plugs increase performance/horsepower? Yes, they also last longer than platinum but are more expensive.

Thread, Nut & Gap Sizes

To fit your vehicle perfectly, you need to look at the thread and nut sizes of the spark plug. Most thread sizes vary from 10mm to 18mm. Additionally, most of the popular models have nut sizes that range between 14mm and 20.63mm. Gap size also has an effect on the voltage required to jump the gap, so you must pay attention to the specifications. When plugs are pre-gapped, you might still need to adjust it for your vehicle.

Heat Specifications

Spark plugs are often put into two classifications – either hot or cold. The temperature generated from the tip of the spark plug determines longevity since heat is damaging to the plug. Check the plug's heat specifications to ensure it fits between the range of numbers provided by the manufacturer.

Life Expectancy

While considering the spark plug horsepower gain is important, you also want to look at how long the parts will last. After all, there's no sense investing money in components that require constant replacement. Iridium spark plugs last the longest, but plenty of platinum options can go up to 100,000 miles. 

Price & Warranty

If you want performance spark plugs for horsepower, consider what the set costs per mile. Break down the rated longevity by how much you are spending. You might find that you are spending less per mile than if you purchased the cheap spark plugs. Plus, it’s imperative to buy from a company with a lengthy warranty.


8 Best Spark Plugs For Horsepower Reviewed

1. NGK BKR5EIX-11 Iridium IX

Best Spark Plugs for Horsepower

Core Material

Iridium

Top Material

Copper

Plug Type/Number

BKR5EIX-11

Gap Size

.044

How Many?

1/4

Can performance spark plugs increase horsepower? If any can, this set of highly-rated NGK plugs is capable. NGK focuses closely on performance, ensuring you get the most out of your vehicle. The Iridium IX spark plug provides more ignitability, superior anti-fouling ability, and improved throttle response. These plugs feature a 0.6mm laser-welded fine iridium tip that provides a longer life and stable spark.

Plus, there is a tapered ground electrode that minimizes the electrical quenching effect. With the long insulator nose, you are also protected from fouling, while the corrugated ribs ensure less flashover. There is also a triple gasket seal that eliminates combustion gas leakage. With the high melting point of the iridium alloy, you have more resistance against electrical wear and heat.

You can purchase these spark plugs for your select Nissan, Jaguar, Hyundai, Kia, Subaru, and Toyota vehicles. There's also an option to purchase one or four spark plugs. Sadly, the company only offers a 60-day warranty, which isn't as long as most others. Even still, customers continue to be happy and don't hint at any sign of trouble. For a simple tune-up to increase horsepower, you can’t ask for much more than what NGK has to offer.

Pros

  • Highly-rated
  • Tapered ground electrode
  • Iridium construction
  • Long life

Cons

  • Only 60-day warranty

2. Bosch 9620

Runner Up

Core Material

Iridium

Top Material

Iridium

Plug Type/Number

9620

Gap Size

.040

How Many?

1/4/10

If you drive select Chevrolet or Nissan vehicles, you can perform a tune-up with these high-end spark plugs. The double iridium firing pin combined with the ground electrode pin offers four times more service life when compared with OEM copper plugs. Plus, there is a 0.6m fine wire firing pin included that increases the performance and provides better ignitability.

In addition, there is a 360-degree continuous laser weld for more corrosion resistance and better durability. The spark plugs come pre-gapped for the perfect fit and plenty of performance. Bosch is known as a leader in performance automotive parts, from spark plugs to oil filters. You can purchase everything you need for a quick tune-up from this manufacturer.

Plus, there is an option to buy a one-, four- or ten-pack of plugs, based on what your needs are. While Bosch provides a seven-year satisfaction guarantee on the plugs, you have to be prepared to pay more for these double iridium options. Ask yourself how much is the added performance worth to you? If you don’t want to change your spark plugs often and you want maximum protection for your engine, the price won’t phase you. Just read through the other exceptional customer reviews if you are on the fence.

Pros

  • Highly-rated
  • 7-year satisfaction guarantee
  • Double iridium construction
  • Long service life

Cons

  • Expensive

3. NGK 7090 BKR5EGP G-Power

Best for ATVs & Motorcycles

Core Material

Platinum

Top Material

Copper

Plug Type/Number

7090 BKR5EGP

Gap Size

.039

How Many?

1/4

Whether you have a compatible ATV, motorcycle or vehicle, these G-Power platinum alloy spark plugs will offer the performance you are searching for. With these upgraded plugs, you can also expect improved fuel efficiency, quicker starts, and reduced emissions for a better environment. This set includes 0.6mm laser-welded fine Platinum tips to reduce the voltage needed, ensuring better durability and a stable spark.

The special insulator nose configuration improves throttle responses while also preventing fouling. Plus, the corrugated ribs located on the insulator prevent flashover. Because the ground and center electrode are made from platinum alloy, you can also expect a greater spark, thanks in part to the pre-gapped plug. The trivalent metal plating further provides protection from seizing and corrosion, with the triple gasket seal meant to eliminate combustion gas leakage.

Use this set of spark plugs for your ATV, motorcycle or compatible Chevy, Chrysler, Dodge, Jeep, Subaru or Toyota vehicle. The company offers these spark plugs in sets of one or four. You get your best value by purchasing four at a time, but you might not always need a complete set. While these spark plugs are highly rated, you must keep in mind that the company only provides a 60-day warranty, which doesn’t compare to other brands.

Pros

  • Highly-rated
  • Compatible with many vehicles
  • Trivalent metal plating
  • Durable construction

Cons

  • Only 60-day warranty

4. NGK IZFR5K-11 Laser Iridium

Highly Rated for Mid-Sized SUVs

Core Material

Iridium

Top Material

Copper

Plug Type/Number

IZFR5K-11

Gap Size

.044

How Many?

1

Do you own a Saturn, Honda, or Acura SUV? If so, these platinum spark plugs might be the right choice for you. The laser-welded iridium center electrode tip provides a better spark and plenty of durability. Plus, it comes with a platinum disc that's welded to the electrode's backside for more life. As with many other NGK spark plugs, this option has a long insulator nose to prevent fouling, while the corrugated ribs prevent flashover. There is also a triple gasket seal, which eliminates any combustion gas leakage.

Not only can you expect more power after your tune-up, but also quicker acceleration and faster starts. You might even notice an increase in your fuel economy while lowering emissions. NGK is known for producing spark plugs that have a special trivalent metal plating to provide anti-seizing and anti-corrosion properties.

Now, this set is only available individually. If you need more than one, you need to purchase multiples. Again, NGK only provides a 60-day warranty, and you might notice that these spark plugs cost a little more than average. However, customer reviews are exceptional, proving that it's an excellent buy if you want maximum performance out of your mid-size SUV.

Pros

  • Reputable brand
  • Reduce emissions
  • Trivalent metal plating
  • Iridium performance

Cons

  • Only 60-day warranty
  • Expensive

5. Briggs & Stratton 796112-2pk

Best Lawnmower Spark Plugs for Increased HP

Core Material

Copper

Top Material

Copper

Plug Type/Number

796112 (J19LM, RJ19LM, 802592, 5095K)

Gap Size

.030

How Many?

2

Your lawnmower deserves just as much attention as your vehicle. You can gain more power from your lawnmower with a simple tune-up, which should be done every spring. This set of spark plugs is made by Champion, which is a leader in the industry. With the company’s experience producing spark plugs, you know you can trust the construction.

By replacing your spark plug with these, you help produce a better spark that’s required for proper ignition. Because it isn’t worn or dirty, you get more voltage for a better spark. This spark plug is also built to avoid fouling and corrosion while making it easier to start your lawnmower engine.

As a lawnmower set of spark plugs, you won’t have to spend a lot to complete your tune-up. This set of two plugs is priced extremely competitively, especially since the company offers a two-year warranty. While the customer reviews speak highly of the set, there are some recent concerns to be aware of. Some customers are complaining about damaged spark plugs and trouble getting the right ones. Maybe it’s just a recent fluke or a sign that the company is going downhill. Hopefully, the issues are worked out quickly, so you can mow your lawn.

Pros

  • Low cost
  • Improved performance
  • Fits many models
  • 2-year warranty

Cons

  • Recent shipment issues

6. Autolite AR3910X

Best Racing Spark Plug for HP

Core Material

Yttrium-enhanced alloy

Top Material

Nickel

Plug Type/Number

AR3910X

Gap Size

.030

How Many?

1

If you want to push your V8 racing engine to the limits, you need to upgrade the spark plugs. Thankfully, this spark plug from Autolite is the top choice among many professional racers. Why are these so popular? Autolite uses Yttrium-enhanced alloy materials, providing an eight-percent reduction of the side wire temperatures. This unique construction improves durability while offers less pre-ignition.

The Autolite racing plugs also come with a colder heat range than the majority of spark plugs on the market. The cut background electrode further improves ignitability and provides a faster flame kernel growth. With the nickel plate finish, you can count on corrosion resistance and a longer service life. With the lower price point, you can also change out the spark plug often to ensure maximum performance.

The company does provide a limited lifetime warranty, which is exceptional. With this protection, there’s very little to worry about. Even the customer reviews comment that this is a top choice among racing spark plugs. However, some people are concerned that Autolite is an off-shoot of Fram, which doesn’t specialize in manufacturing performance products. If this worries you, it might be preferable to choose another brand, but we see no reason to be concerned.

Pros

  • Designed for race cars
  • Limited lifetime warranty
  • Yttrium-enhanced alloy construction
  • Corrosion-resistant

Cons

  • Made by Fram

7. ACCEL 8199 U-Groove

Best Smaller Option for Increased HP

Core Material

Copper

Top Material

Copper

Plug Type/Number

AR3910X

Gap Size

.032

How Many?

8

If you need spark plugs that work well in a cramped space, ACCEL makes a great option. This set fits select Chevrolet, Ford, Jeep, Oldsmobile, and Lincoln vehicles. You get all eight spark plugs, so you don't need to worry about having everything needed for your tune-up. These performance spark plugs create a larger spark to produce additional power at higher RPMs.

Plus, these spark plugs can improve the throttle response while reducing fouling and bumping up the fuel economy for additional savings. These are concerns most drivers are thinking about. The plugs have a purified Alumina insulator that keeps arching to a minimum. Plus, there are fewer reports of fouling and misfiring after the installation. The only complaint about these spark plugs is the lower performance versus what you get with platinum or iridium style options.

The sparks also come pre-gapped, so there’s virtually nothing to do before installation. Plus, customers continue to give favorable reviews, which prove there’s little to worry about. Additionally, the company provides a one-year warranty for maximum protection. What’s most interesting is the low price, making it simple to perform a tune-up on a budget. It’s difficult to find these smaller options, which is what makes the ACCEL construction unique.

Pros

  • Meant for small clearance
  • Low cost
  • 1-year warranty
  • More power at higher RPMs

Cons

  • Shorter lifespan

8. ACDelco -12680072 41-110

Best for Trucks & SUVs

Core Material

Iridium

Top Material

Iridium

Plug Type/Number

41-110

Gap Size

.04

How Many?

4

ACDelco is the brand that makes GM parts, so you can trust this company to provide spark plugs for your Chevy, GMC, Cadillac or Buick vehicle. ACDelco takes the construction of these spark plugs to new levels. They are made from iridium to create a high-performance option at a reasonably low price. With a higher melting point than platinum plugs, you can burn fuel efficiently while receiving a better performance. 

Because of the unique construction, you can expect a service life reaching 100,000 miles under ideal driving conditions. It also features an iridium-tipped center electrode, which is half the size of other options. This set of plugs creates fewer carbon deposits because of the cleaner burning design. There’s also less chance of plug fouling, which helps your vehicle run at its best.

Choose a pack of one or four spark plugs, based on what your needs are. Additionally, ACDelco does offer a one-year warranty on these automotive parts, ensuring that there won’t be any manufacturing defects. It’s difficult to find any negative reviews about this part number. However, there have been some recent shipment issues. If you encounter any trouble, it’s best to reach out to the manufacturer immediately.

Pros

  • Reputable company
  • Long service life
  • 1-year warranty
  • Fewer carbon deposits

Cons

  • Shipment issues

Spark Plug Replacement: Installation Guide

You might need to replace the spark plugs simply because it is time, or the engine might not be running its best. Once you find better spark plugs for more horsepower, you want to know how to install them. While installing spark plugs can differ depending on the vehicle, here are a few tips for your next tune-up.

  1. 1
    Locate the spark plugs. If you drive a four-cylinder engine, there will probably be four spark plugs. Read the manual if you aren’t sure where the plugs are.
  2. 2
    Work with a cool engine only. You don’t want to burn your hand.
  3. 3
    Remove the old spark plug with a socket wrench.
  4. 4
    Use a spark plug gap gauge to ensure it is precise.
  5. 5
    Install the new plug.

Here’s a helpful video to get you started.


People Also Ask (FAQs)

Does the brand of spark plugs matter? Are NGK or AC Delco spark plugs better?

Yes, no-name brands might not put as much attention into the construction process, thereby leaving you with spark plugs that underperform. Both NGK and ACDelco are considered top brands if you want more performance from the engine.

How much horsepower do spark plugs add? Can spark plug wires also help?

Can new spark plugs increase horsepower? Not necessarily because of the spark plug itself, but because you are helping the engine run more efficiently. So, do spark plug wires increase horsepower? Again, it’s not because of the wires, but simply the act of performing a tune-up and making sure the engine runs its best.

Are spark plugs universal to all engines?

No, you must use spark plugs that are meant for your vehicle engine. While some will fit a multitude of models, there are no spark plugs that are considered universal.

How frequently should spark plugs be replaced?

It truly depends on what type of spark plugs are being used and how you drive. In many cases, you can drive up to 100,000 miles without requiring a spark plug replacement.

Where is the best place to buy a spark plug for horsepower gain?

Reduce your tune-up cost by purchasing spark plugs on Amazon. You may also be interested in buying the best engine tuner, which is guaranteed to add more horsepower.


Conclusion

What are the best spark plugs for horsepower? If you drive select Hyundai, Nissan, Toyota or Jaguar models, we recommend the NGK BKR5EIX-11 Iridium IX set of spark plugs. You can purchase one or four, based on your needs, and get the performance you desire.

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