NGK Laser Iridium Spark Plug Set EJ255/EJ257

HIGH PERFORMANCE IRIDIUM SPARK PLUGS

NGK's Laser Iridium spark plugs are an OE high performance spark plug with exceptional longevity.  The 0.6mm fine wire iridium center electrode, 6x denser than platinum and with an extremely high melting point, provides increased service life, improved ignitability and throttle response.  The platinum ground electrode provides increased longevity vs. the iridium IX's nickel electrode.  The high-grade pure alumina ceramic and 98% pure copper core enables the dissipation of large amounts of heat to prevent plug overheating and ensure reliable starting.

The plug gaps are controlled with laser precision throughout the manufacturing process and should not be re-gapped unless absolutely necessary (due to the fragility of the center electrode).  A trivalent metal plating prevents corrosion and provides anti-seizing properties (anti-seize is not required on the threads).

Sold as a set of 4 spark plugs.

Manufacturer Part No. SILFR6A (Subaru 22401AA670)

Fits the following:

• EJ255 (WRX MY08-14)
• EJ255 (Forester XT MY09-13)
• EJ255 (Legacy GT/Outback XT MY05-09)
• EJ257 (STI MY08-18)