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.. NGK Laser Iridium High Ignitability spark plugs offer the most advanced OE spark plug tip technology providing the optimal combination of performance and durability. Actual OE or equivalent replacement spark plugs.. SUBARU FORESTER 2013-09, IMPREZA 2014-08, LEGACY 2009-05, OUTBACK 2009-05, TRIBECA 2009-08, WRX 2014-12, WRX STI 2014-13. RECOMMENDED USAGE: Best for vehicles with OE SPE iridium alloy plugs. NGK Laser Iridium Long Life Spark Plug Box of 4 (SILFR6A). NGK Laser Iridium High Ignitability Spark Plug. Laser Iridium H. I. Spark Plug. High Ignitability Spark Plug. H. I. Spark Plug. Spark Plug

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