Super Fire Racing Spark Plug Set

Fitment
Subaru Impreza WRX EJ255 2005 To 2007
Subaru Impreza WRX STi EJ257 2005 To 2007
Subaru Impreza WRX EJ255 2007 To 2010
Subaru Impreza WRX STi EJ257 2007 To 2014
Subaru Impreza WRX STi EJ207 2007 To 2014
Subaru WRX STi EJ257 2014 to 2021
Subaru WRX STi EJ20Y 2014 To 2021
Subaru Legacy Twin Scroll 2003 To 2009
Subaru Legacy GT EJ255 2009 To 2014
Subaru Impreza 1.5R/2.0R 2005 To 2010
Subaru Legacy 2.0R 2005 To 2009
Subaru Forester XT EJ255 2004 To 2008
Subaru Forester STi EJ255 2004 To 2007

Fitment Notice: Impreza WRX, STi & WRX STi Models 2007 To 2021 will need gapping before fitting

• 0.6mm Iridium Alloy Center Electrode
  Iridium alloy center electrode reduces voltage requirement and improves ignition performance and durability.
• Outer Electrode with Platinum Chip
  The outer electrode incorporates a square platinum chip which improves durability, and combining with the iridium center electrode boosts ignition performance.
  The outer electrode features a shortened tip design and tapered shape while maintaining the necessary space for proper ignition.
• Short Type Outer Electrode (Anti-Vibration)
  The outer electrode has been shortened and engineered with the ideal shape to decrease weight for resistance against vibration. This anti-vibration design improves longevity of the outer electrode.
• Thermal Edge
  After long idling or under various combustion conditions, carbon buildup can occur causing misfires. The thermal edge of the ceramic insulator discharges to help decrease carbon deposits.
• Spark Support Gap
  Discharge occurs in the spark support gap (space between the tip of insulator and the base of the outer electrode) to help prevent carbon buildup.
• Increased Ignition Performance
  Decreased voltage requirement strengthens ignition performance under harsh conditions like lean mixture or high boost pressure.
• Improved Durability
  New material and design improve durability which allows for use under hard combustion conditions like continuous high load during circuit driving or aggressive tuning.
  * Improper combustion condition and wrong heat range selection may cause damage to the spark plug.
• Decreased Carbon Deposits
  Thermal edge and spark support gap help prevent carbon buildup for better ignition under various combustion conditions.

HKS          25    30    35    40    45    50    52.5   55
DENSO    16    20    22    24    27    31     32      34
NGK           5     6      7      8      9    10     10.5     11