NGK Laser Iridium SILFR6A Long Life Spark Plug - Box of 4 — Fits Subaru & Dodge SRT Hellcat

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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About NGK

NGK engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full NGK lineup with fast shipping and expert fitment support — order with confidence.

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NGK Laser Iridium SILFR6A Spark Plugs: Ultimate Performance & Longevity

Unlock superior ignition performance and extended service life with NGK Laser Iridium SILFR6A spark plugs. This box of four plugs is meticulously engineered for OE applications, providing the best combination of power and durability. Ideal for a wide range of Subaru models including Impreza, Forester, Legacy, Outback, and Tribeca, as well as high-performance Dodge Challenger and Charger SRT Hellcat vehicles.

Advanced Ignition Technology

  • Iridium Tipped Center Electrode: Offers exceptional durability, six times harder than platinum, ensuring consistent spark and extended plug life.
  • Platinum Pad/Fine Wire Tip: Featured on the ground electrode for even wear in distributorless ignition systems, optimizing spark performance and reliability.
  • High-Grade Pure Alumina Ceramic: Prevents overheating and provides a robust insulator for optimal dielectric strength.
  • 98% Pure Copper Core: Ensures reliable starts and excellent heat transfer, maintaining stable operating temperatures.
  • Optimized for OE Applications: Tested to the highest standards for quality and durability, guaranteeing a perfect fit and function.

Invest in NGK Laser Iridium SILFR6A spark plugs for improved fuel efficiency, smoother idle, and enhanced engine response. Find your set at GGCRACING today.

Vehicle Fitment

Years Make Model Trim
2015-2020 Dodge Challenger SRT Hellcat
2015-2020 Dodge Charger SRT Hellcat
2009 Subaru Forester XT
2009-2010 Subaru Forester XT Limited
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester XT Touring
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2005 Subaru Legacy GT Limited
2005-2006 Subaru Legacy GT
2006-2009 Subaru Legacy GT spec.B
2005-2006 Subaru Outback XT
2005-2009 Subaru Outback XT Limited
2008-2009 Subaru Tribeca Base
2008-2009 Subaru Tribeca Limited
2015 Subaru WRX STI Launch Edition
2015-2018 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue

Product Details

Product Description
Part Numbers
Sizing & Fit

About NGK

NGK engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full NGK lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

NGK Laser Iridium SILFR6A Spark Plugs: Ultimate Performance & Longevity

Unlock superior ignition performance and extended service life with NGK Laser Iridium SILFR6A spark plugs. This box of four plugs is meticulously engineered for OE applications, providing the best combination of power and durability. Ideal for a wide range of Subaru models including Impreza, Forester, Legacy, Outback, and Tribeca, as well as high-performance Dodge Challenger and Charger SRT Hellcat vehicles.

Advanced Ignition Technology

  • Iridium Tipped Center Electrode: Offers exceptional durability, six times harder than platinum, ensuring consistent spark and extended plug life.
  • Platinum Pad/Fine Wire Tip: Featured on the ground electrode for even wear in distributorless ignition systems, optimizing spark performance and reliability.
  • High-Grade Pure Alumina Ceramic: Prevents overheating and provides a robust insulator for optimal dielectric strength.
  • 98% Pure Copper Core: Ensures reliable starts and excellent heat transfer, maintaining stable operating temperatures.
  • Optimized for OE Applications: Tested to the highest standards for quality and durability, guaranteeing a perfect fit and function.

Invest in NGK Laser Iridium SILFR6A spark plugs for improved fuel efficiency, smoother idle, and enhanced engine response. Find your set at GGCRACING today.

Vehicle Fitment

Years Make Model Trim
2015-2020 Dodge Challenger SRT Hellcat
2015-2020 Dodge Charger SRT Hellcat
2009 Subaru Forester XT
2009-2010 Subaru Forester XT Limited
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester XT Touring
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2005 Subaru Legacy GT Limited
2005-2006 Subaru Legacy GT
2006-2009 Subaru Legacy GT spec.B
2005-2006 Subaru Outback XT
2005-2009 Subaru Outback XT Limited
2008-2009 Subaru Tribeca Base
2008-2009 Subaru Tribeca Limited
2015 Subaru WRX STI Launch Edition
2015-2018 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue

Product Details

Product Description

About NGK

NGK engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full NGK lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

NGK Laser Iridium SILFR6A Spark Plugs: Ultimate Performance & Longevity

Unlock superior ignition performance and extended service life with NGK Laser Iridium SILFR6A spark plugs. This box of four plugs is meticulously engineered for OE applications, providing the best combination of power and durability. Ideal for a wide range of Subaru models including Impreza, Forester, Legacy, Outback, and Tribeca, as well as high-performance Dodge Challenger and Charger SRT Hellcat vehicles.

Advanced Ignition Technology

  • Iridium Tipped Center Electrode: Offers exceptional durability, six times harder than platinum, ensuring consistent spark and extended plug life.
  • Platinum Pad/Fine Wire Tip: Featured on the ground electrode for even wear in distributorless ignition systems, optimizing spark performance and reliability.
  • High-Grade Pure Alumina Ceramic: Prevents overheating and provides a robust insulator for optimal dielectric strength.
  • 98% Pure Copper Core: Ensures reliable starts and excellent heat transfer, maintaining stable operating temperatures.
  • Optimized for OE Applications: Tested to the highest standards for quality and durability, guaranteeing a perfect fit and function.

Invest in NGK Laser Iridium SILFR6A spark plugs for improved fuel efficiency, smoother idle, and enhanced engine response. Find your set at GGCRACING today.

Vehicle Fitment

Years Make Model Trim
2015-2020 Dodge Challenger SRT Hellcat
2015-2020 Dodge Charger SRT Hellcat
2009 Subaru Forester XT
2009-2010 Subaru Forester XT Limited
2010-2013 Subaru Forester XT Premium
2011-2013 Subaru Forester XT Touring
2008-2014 Subaru Impreza WRX STI
2009-2010 Subaru Impreza 2.5 GT
2009-2014 Subaru Impreza WRX Premium
2010 Subaru Impreza WRX STI Special Edition
2010-2014 Subaru Impreza WRX Limited
2011-2014 Subaru Impreza WRX STI Limited
2005 Subaru Legacy GT Limited
2005-2006 Subaru Legacy GT
2006-2009 Subaru Legacy GT spec.B
2005-2006 Subaru Outback XT
2005-2009 Subaru Outback XT Limited
2008-2009 Subaru Tribeca Base
2008-2009 Subaru Tribeca Limited
2015 Subaru WRX STI Launch Edition
2015-2018 Subaru WRX STI Base
2016 Subaru WRX STI Series.HyperBlue

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