NGK (LFR7AIX) Iridium IX 1 Step Colder Spark Plugs Subaru WRX 2006-2014 / STI 2004-2021 | 2309

Fitment Information: 2006-2014 Subaru WRX  2004-2021 Subaru STi  2005-2009 Subaru Legacy GT 2005-2009 Subaru Outback XT 2004-2008 Subaru Forester XT Features: Sold as a set of 4 spark plugs 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 Longevity: 50k Miles 60 Days manufacturer Warranty ShellSpark Plug Thread Diameter: 14mmThread Pitch: 1.25mmSeat Type: FlatReach: 26.5mm (1.04")Wrench Diameter: 5/8" (16mm)Terminal Type: SolidGap: .031" (0.8mm) Center ElectrodeElectrode Tip Material: IridiumElectrode Core Material: Copper Ground ElectrodeMaterial: NickelType: StandardShape: Taper Cut SpecificationsResistor: YesResistor Value: 5k OhmManufacturer Heat Range: 7Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft. Why NGK Iridium? More Durability and a Higher Melting Point compared to Platinum, better center electrode anti-oxidation and anti-erosion, improved ignition, superior anti-fouling, lower required voltage, new metal shell plating process for better anti-corrosion. One Step Colder plugs are recommended for cars with heavy modifications. These NGK plugs will get your Turbo Subaru running smoother and free up some power through increased efficiency and increased heat resistance. These are available in stock heat or one step colder for cars running approximately 100 horsepower more than stock. Please Note: Iridium plugs are able to use larger gap setting with less voltage. Some customers choose to regap these plugs to correct misfiring or tune for optimal spark -- do so at your own risk -- slide-type plug gapper will damage the fragile iridium tip.