NGK Iridium Spark Plug 7 Series BKR7EIX, NGK 2667 - 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 Gap: 0.031" (0.8mm), for boost up to 22 PSI we recommend a gap size of 0.027-0.029". For boost levels between 23-28 then set the gap to 0.026".  Applications USDM WRX 2.0L 2002-2005 = 1 Step Colder than stock (6 is the stock heat range) JDM version 7/8/9 ej207 = stock heat range (factory replacement plug) JDM version 7/8/9 ej205 (not ej20x/y) = 1 step colder than factory Does not f