These NGK Laser Iridium spark plugs are a top - notch choice for multiple Subaru models, including the 2009 - 2013 Forester, 2008 - 2014 WRX, 2013 - 2018 WRX STI, 2005 - 2009 Legacy GT, 2005 - 2009 Outback, and 2008 - 2009 Tribeca. They offer excellent performance and long - lasting durability. Key features include a trivalent metal plating that resists corrosion and seizing, corrugated ribs to prevent flashover, a pure alumina silicate ceramic insulator for great strength and heat transfer, a copper core for efficient heat removal, triple seals to stop leakage, and a 100k - mile lifespan. They come with a 60 - day manufacturer warranty. The spark plugs have a 14mm thread diameter, 1.25mm thread pitch, flat seat type, 26.5mm reach, 5/8' (16mm) wrench diameter, solid terminal type, and a.031' (0.8mm) gap. The center electrode uses iridium tip and copper core, while the ground electrode is made of nickel. They have a 5k Ohm resistor, a manufacturer heat range of 6, and specific torque specs for cast iron (18 - 25.3 lb. ft.) and aluminum (18 - 21.6 lb. ft.). Often used as original equipment, these plugs offer the best blend of performance and longevity. The iridium tip is six times harder than platinum, ensuring strong ignitability and a long life. Most of them also have a platinum pad on the ground electrode for even wear in DIS ignition systems. Import Image Racing is an authorized dealer, so your purchase is guaranteed to be authentic and covered by the manufacturer warranty.
Using these NGK Laser Iridium spark plugs is straightforward. First, make sure your vehicle's engine is cool before starting. Carefully remove the old spark plugs one by one. When installing the new ones, use a torque wrench to tighten them according to the specified torque: 18 - 25.3 lb. ft. for cast - iron engines and 18 - 21.6 lb. ft. for aluminum engines. This will prevent over - or under - tightening. Be careful not to damage the electrodes during installation. As for maintenance, these spark plugs are designed to last up to 100,000 miles, but it's a good idea to check them periodically. Look for signs of wear, corrosion, or fouling. If you notice any performance issues like rough idling or poor acceleration, it might be time to replace the spark plugs. Keep in mind that these plugs are covered by a 60 - day manufacturer warranty, so if you have any problems within this period, you can reach out to us.
