NGK Ruthenium HX Spark Plug Subaru WRX / STI / Impreza /Outback (LFR6BHX) - Set of 4 - Dirty Racing Products

NGK Ruthenium HX Spark Plug Subaru WRX / STI / Impreza /Outback (LFR6BHX) - Set of 4


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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.

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


  • Center Electrode Core Material: Copper
  • Center Electrode Tip Material: Ruthenium
  • Electric Terminal Type: Non-Removable Nut
  • Ground Configuration: Standard
  • Ground Electrode Core Material: Copper
  • Ground Electrode Tip Design: Projected Square Platinum Electrode - High Ignitability
  • Hex Size: 5/8"
  • Insulator Height: 50.50mm
  • Manufacturer Heat Range: 6
  • Pre-Gap Size: .032 in
  • Reach: 26.5 mm 
  • Resistance: 5000 Ohms
  • Seat Type: Flat
  • Thread Diameter: 14.00 mm


  • 2004-2006 Subaru Baja
  • 2004-2013 Subaru Forester
  • 2004-2014 Subaru Impreza
  • 2005-2019 Subaru Legacy
  • 2005-2019 Subaru Outback
  • 2013-2014 Subaru WRX
  • 2013-2018 Subaru WRX STI

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