2018 Subaru WRX STI Spark Plugs
Your 2018 Subaru WRX STI might be the best vehicle you’ve ever owned. Or you may just be struggling to keep it highway-approved. No matter the situation, Advance Auto Parts has the Spark Plugs you desperately need.
We currently carry 14 Spark Plugs to choose from for your 2018 Subaru WRX STI, and our inventory prices range from as little as $3.49 up to $17.99.
On top of low prices, Advance Auto Parts offers 4 different trusted brands of Spark Plugs for the 2018 Subaru WRX STI. We only sell parts from trusted brands like Autolite so that you can find quality parts you can count on.
Don’t take our word for it – check out customer ratings and reviews to buy with confidence. We have 992 reviews on our Spark Plugs for the 2018 Subaru WRX STI from previous customers.
Have parts delivered straight to your home, or find the nearest Advance Auto Parts store to check out our Spark Plugs stock in-person!
Spark Plugs for Your 2018 Subaru WRX STI
DENSO – Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, last 100K+ Miles, IKH20TT (Part No.4704)
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$10.99
Durability of an OE style plug combined with Power & Torque of high performance.
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Product Features:
- 0.4mm Iridium Center Electrode: World’s Smallest Diameter that maximizes firing potential
- 0.7mm Needle Tip Ground Electrode: Promotes higher spark energy and less heat quenching
- DENSO Patented Optimized Iridium-Rhodium Alloy Formula: Highest concentration of Iridium vs. competitors for greater durability
- DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
- Durability of an OE style plug combined with Power & Torque of high performance.
- Withstands temperatures greater than 4000° Fahrenheit
- Iridium TT
NGK – OE Series Laser Iridium High Ignitability Spark Plug: SPE Tip Design, SILFR6A (Part No.7913)
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$17.99
NGK Laser Iridium High Ignitability spark plugs offer the best combination of performance and longevity. Engineered specifically for OE applications, Laser Iridium High Ignitability spark plugs are tested to the highest standards to ensure quality and durability. Iridium tipped center electrode provides durability six times harder than platinum. NGKs high grade pure alumina ceramic and 98 percent pure copper core prevents the spark plug from overheating while providing reliable starts. Laser Iridium High Ignitability spark plugs feature raised platinum pad or platinum fine wire tip on the ground electrode for even wear in distributorless ignition systems and improved spark performance.
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Product Features:
- ACTUAL OE or EQUIVALENT HIGH IGNITABILITY DESIGN: SPE tip & iridium alloy center electrode produce the most advanced OE spark plug technology
- IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
- SPE DESIGN: Square platinum electrode shape of the ground electrode provides the best ignitability and service life for high heat engines
- SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
- TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
- RECOMMENDED USAGE: Best for vehicles with OE SPE iridium alloy plugs
Autolite – Copper Spark Plug: Delivers Quick Starts, Good Fuel Economy, Smooth Acceleration (Part No.5325)
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$3.49
Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Guaranteed to deliver quick starts, good fuel economy and smooth acceleration, Autolite Copper Core spark plugs are designed to meet or exceed OES design requirements. Consider upgrading to Autolite Platinum, Double Platinum or Iridium XP plugs for improved engine performance. Copper core plugs are the industry standard.
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Product Features:
- Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
- Multi-rib insulator reduces danger of “flash-over”
- One-piece terminal post adds strength
- Resistor reduces radio frequency interference (RFI) and electrode erosion
NGK – Ruthenium HX High Ignitability Spark Plug: PSPE Tip Design, LFR6BHX (Part No.93420)
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$14.79
NGK Ruthenium HX High Ignitability spark plugs are the best in class plug for todays modern vehicles. Patented Ruthenium technology offers the most advance tip technology and delivers the highest performance and life expectancy. Created from advanced OE technology as a high ignitability plug; Ruthenium HX spark plugs come with patented, specialized OEM DFE and PSPE tip designs. NGK Ruthenium HX High Ignitability spark plugs provide a more complete fuel burn resulting in a quicker throttle response, smoother idle and better cold starts. Ruthenium center electrode provides industry leading durability.
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Product Features:
- HIGH IGNITABILITY PROJECTED SQUARE PLATINUM ELECTRODE DESIGN: Combines 0.6 millimeter ruthenium center with a unique cut-back PSPE ground electrode
- RUTHENIUM ALLOY CENTER ELECTRODE: NGK’s patented ruthenium technology produces maximum performance, ignitability & durability at high temperatures
- PSPE DESIGN: Projected square platinum electrode shape of the ground electrode provides the best ignitability and service life for high heat engines
- SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
- TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
- RECOMMENDED USAGE: Modern vehicles using OE PSPE type spark plugs or for those seeking an aftermarket plug with the latest OE technology
Champion – Double Platinum & Power Spark Plug Exceptional Perf OE Replacement REC10PYPB4 (Part No.7975)
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$7.99
Champion® Double Platinum Power¿ spark plugs deliver more powerful performance. Featuring exclusive Heat-Active¿ alloy, platinum fine wire center electrode and platinum pad ground electrode provide maximum life and sharper spark focus.
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Product Features:
- Double Platinum Power – Premium Spark Plug. More Powerful Performance.
- Platinum center and ground electrode for greater wear resistance
- Maintains stable operating temperature under all engine loads
- Fine-wire center electrode for greater ignitability
- V-trimmed ground electrode promotes sharper spark focus
- Heat-Active┐ alloy allows electrodes to reach optimal temperature
Autolite Iridium – Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition (Part No.XP5325)
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$9.99
Our best spark plug! Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, the Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition for enhanced ignitability and performance. Features double Iridium-enhanced alloy technology center electrode for improved durability and wear resistance.
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Product Features:
- 0.6 mm finewire design improves ignitability
- Patented V-trimmed platinum sidewire technology resists wear
- OE equivalent design is engineered for every engine
- Designed for better overall durability with virtually no gap erosion
Autolite – Platinum Spark Plug: Fires Cleaner, Easier Starts, Quicker Acceleration (Part No.AP5325)
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$4.79
Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Platinum spark plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability. Consider upgrading to Autolite Double Platinum or Iridium XP spark plugs for increased performance.
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Product Features:
- High nickel alloy side electrode maintains precise gap
- Full platinum tip assures virtually no gap erosion for long life
- Necked-down center electrode fires quicker, cleaner with less voltage for easier starts, quicker acceleration and improved fuel economy (as compared to standard plugs)
Autolite – Double Platinum Spark Plug: Platinum Firing, Superior Durability, Longer Life (Part No.APP5325)
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$6.79
Autolite has over 100 years of engineering experience and has sold over 11 billion plugs. Designed and engineered in the USA, Autolite Double Platinum spark plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug. Consider upgrading to Autolite Iridium XP spark plugs for increased performance.
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Product Features:
- Works to optimize engine performance for a longer life and improved fuel economy
- OE design
- Full-platinum tips; platinum on both the center and side electrodes to promote reduced gap wear
- Platinum ball welding process provides a consistent point of contact for enhanced adhesion
DENSO – Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IKH20 (Part No.5344)
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$12.29
Increased performance with World’s smallest Iridium Center Eletrode (0.4mm).
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Product Features:
- World’s smallest Iridium Center Electrode (0.4mm) for improved spark for maximum combustion
- Patented 360-degree laser welding assembly process
- U-groove and taper cut ground electrode to maximize flame propagation.
- Withstands temperatures greater than 4000¦ Fahrenheit
- Burnished nickel plating for high temperature endurance and superior corrosion resistance
- Wide range of part numbers for thousands of applications, including classic and collector cars
- Iridium Power
Autolite Iridium – Iridium Ultra Finewire Spark Plug: Optimal Performance, Durability, Ignitability (Part No.AI5325)
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$10.99
Autolite Iridium Ultra Laser Finewire Spark Plugs are one of our brand’s most technologically advanced products. These spark plugs provide superior durability, more focused ignition with better overall ignitability for optimum performance. Autolite Spark Plugs are the best alternative to OE spark plugs, offering OE fit form and function supporting all foreign and domestic makes and models at a value price. Autolite provides the automotive aftermarket and original equipment manufacturers with the highest quality ignition products and is the leading supplier of spark plugs in the world.
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Product Features:
- Autolite Iridium Ultra is an engineered OE replacement iridium spark plug.
- A laser-welded 0.5mm pure iridium finewire center electrode provides optimal fuel efficiency, acceleration and focused ignitability.
- Nickel-plated shell to resist corrosion.
- High-alumina ceramic insulator for increased strength.
- Laser welded 0.5mm Iridium finewire center electrode.
- Proprietary platinum sidewire technology.
NGK – Iridium IX Spark Plug: Single Iridium Fine Wire, LFR6AIX (Part No.93893)
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$11.99
NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode’s durability is six times harder than platinum. Iridium alloy’s extremely high melting point is perfect for today’s engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.
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Product Features:
- SINGLE IRIDIUM TIP: Fine wire 0.6 millimeter iridium tip center electrode ensures high durability and a consistently stable spark
- IRIDIUM ALLOY CENTER ELECTRODE: Iridium’s density (6x that of platinum) and extremely high melting point is perfect for modern high efficiency engines
- TAPERED CUT GROUND ELECTRODE: Reduced quenching design produces outstanding ignitability, improved acceleration, fuel efficiency and durability
- SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
- TRIVALENT METAL PLATING: Delivers superior anti-corrosion and anti-seizing properties, ensuring ease of installation and removal
- RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
DENSO – Iridium Long-Life Spark Plug: OE Performance, last 100K+ Miles, SK20HPR-L11 (Part No.3433)
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$15.79
Manufactured to the strictest OE performance, durability and emissions standards.
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Product Features:
- Latest OE technology with DENSO’s patented Iridium Alloy (90% Ir) and fine wire center electrode
- Platinum ground electrode for extended life
- DENSO Patented 360 degree laser welding process: Ensuring exceptional quality bond and structural strength with the Iridium Center Electrode
- Sustained spark performance over 100,000 miles
- Lasts up to three times as long as conventional plugs
- Endures extreme temperatures greater than 4,000 degrees F associated with high-performance ignition and special fuel systems
- Iridium Long Life
NGK – G-Power Spark Plug: Single Platinum Tip Design, LFR6CGP (Part No.1483)
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$10.99
NGK G-Power Platinum spark plugs are the best single platinum spark plugs at an economical price. G-Power plugs feature a fine wire platinum center electrode and a trapezoidal cut ground electrode that offers increased durability, improved fuel efficiency, lower emissions, faster starts and quicker acceleration over conventional nickel spark plugs. An excellent upgrade for vehicles which used nickel alloy spark plugs originally. For better performance consider upgrading to a NGK Iridium IX plug. For even greater performance consider upgrading to a NGK RUTHENIUM HX plug.
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Product Features:
- SINGLE PLATINUM TIP: Fine wire 0.6 millimeter platinum tip center electrode ensures improved durability and a consistently stable spark
- PLATINUM ALLOY: G-Power platinum provides exceptional value with increased performance and longer service intervals than factory nickel plugs
- TRAPEZOIDAL CUT GROUND ELECTRODE: Reduces quenching design produces improved ignitability and performance
- SOLID COPPER CORE: 98% pure copper core offers superior heat dissipation, conductivity and ultra wide heat ranges
- COLD-ROLLED THREADS: Prevents cross-threading and damage to cylinder heads
- RECOMMENDED USAGE: Lower cost alternative to double precious metal spark plugs or as an upgrade to OE nickel alloy spark plugs
DENSO – Iridium Power Spark Plug (Part No.F1000332672ND)
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$12.73
DENSO Iridium Power spark plugs represent a performance breakthrough. The laser-welded center electrode is only 0.4mm in diameter – the slimmest iridium electrode in the industry. The taper-cut side electrode complements the design, delivering reliable spark energy under the most gruelling pressures and temperatures. DENSO engineers used the power of this miraculous metal to produce an iridium center electrode that is only 0.4mm in diameter. With its superior thermal qualities, this whisker-fine electrode is capable of taking the most extreme heat and punishment. This breakthrough was matched to one of DENSO’s most famous innovations, the patented U-Groove ground electrode. The combination of these two features resulted in the Iridium Power® plug, one of the most advanced and innovative spark plugs on the market.
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Product Features:
- Tapered cut, U-Groove ground electrode
- 0.4mm iridium center electrode
- 360-degree laser welding assembly process
- Required ignition voltage reduced
- Unsurpassed center electrode durability
- Available for many performance and power sports applications, including Corvette, Viper, and Harley-Davidson The Iridium Power plug delivers greater spark energy while demanding significantly less secondary required voltage from the ignition system.
FAQs for 2018 Subaru WRX STI Spark Plugs
What are the most popular Spark Plugs for the 2018 Subaru WRX STI?
With 4 brands you can trust, our most popular Spark Plugs for the 2018 Subaru WRX STI parts are:
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$9.99
(166)
Iridium XP Finewire Spark Plug: Improved Durability, More Focused Ignition
Spark Plugs
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$4.79
(131)
Platinum Spark Plug: Fires Cleaner, Easier Starts, Quicker Acceleration
Spark Plugs
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$6.79
(87)
Double Platinum Spark Plug: Platinum Firing, Superior Durability, Longer Life
Spark Plugs
What are the best aftermarket Spark Plugs for the 2018 Subaru WRX STI?
See what past customers had to say about our highest-rated Spark Plugs for the 2018 Subaru WRX STI:
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$12.29
(76)
Iridium Power Spark Plug: Maximum Spark Energy, 0.4mm Iridium Tip, IKH20
“Great spark plug for the money!”
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$17.99
(16)
OE Series Laser Iridium High Ignitability Spark Plug: SPE Tip Design, SILFR6A
“I own a 2012 Subaru WRX and it was a pain to install because it’s an in line 4 but at the end the day you could feel the performance of it, the car st”
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$10.99
(16)
Iridium TT Spark Plug: Ultimate Endurance and Power, 0.4mm Iridium Tip, last 100K+ Miles, IKH20TT
“Very good”
