NGK Iridium Spark Plug 7 Series LFR7AIX, NGK 2309 -Set of 4

Description NGK's IX Iridium Series Plugs were Designed Specifically for the Performance Enthusiast. Fine Wire Center Electrode Ensures High Durability and a Consistently Stable Spark Iridium Alloy has an Extremely High Melting Point, Perfect for Today's High-Tech, High Performance Engines Trivalent Metal Plating Provides Superior Anti-Corrosion and Anti-Seizing Properties Corrugated Ribs Prevent Flashover Pure Alumina Silicate Ceramic Insulator, Provides Superior Strength and Better Heat Transfer Copper Core Aids in Heat Removal Triple Seals Prevent Leakage Includes 4 spark plugs. Specs Heat range: 7 1 step colder than factory for the listed applications Gap: 0.032" (0.8mm), for high boost up to 22 PSI we recommend a gap size of 0.028-0.03". For boost levels between 23-28 then set the gap to 0.026".  Applications 2006-2014 2.5L WRX 2004-2018 2.5L STi 2004-2013 2.5L Forester XT 2004-2013 2.5L Legacy GT / Outback XT 2003-2006 2.5L Baja XT JDM ej20x and ej20y