These NGK Iridium IX spark plugs are a great choice for your Subaru. They fit a wide range of models, including the 2006 - 2014 WRX, 2004 - 2021 STi, 2005 - 2009 Legacy GT, 2005 - 2009 Outback XT, and 2004 - 2008 Forester XT. Sold in a set of 4, they come with many features. The trivalent metal plating offers excellent anti - corrosion and anti - seizing properties. Corrugated ribs stop flashover. The pure alumina silicate ceramic insulator gives high strength and good heat transfer. The copper core helps remove heat, and triple seals prevent leakage. They have a longevity of 50k miles and a 60 - day manufacturer warranty. Compared to platinum, NGK Iridium has more durability, a higher melting point, better anti - oxidation and anti - erosion of the center electrode, improved ignition, superior anti - fouling, and lower required voltage. One - step colder plugs are ideal for heavily modified cars. They'll make your Turbo Subaru run smoother and boost power through increased efficiency and heat resistance. Available in stock heat or one step colder for cars about 100 horsepower more than stock. Note that iridium plugs can use larger gap settings with less voltage. Some customers regap them to fix misfiring or tune for optimal spark, but be careful as a slide - type plug gapper can damage the fragile iridium tip. Import Image Racing is an authorized NGK dealer, ensuring authentic products covered by the manufacturer warranty.
Using these NGK Iridium IX spark plugs is easy. First, make sure your car engine is cool. Remove the old spark plugs and replace them with these new ones. Tighten them according to the torque specs: 18 - 25.3 lb. ft. for cast iron engines and 18 - 21.6 lb. ft. for aluminum engines. As for maintenance, keep an eye on their performance. If you notice misfiring or a drop in engine power, it might be time to check the spark plugs. Remember, iridium plugs are delicate. Avoid using a slide - type plug gapper to change the gap as it can damage the iridium tip. If you need to regap them, do it carefully. Also, these plugs have a 60 - day manufacturer warranty, so if there are any issues during this period, contact us. They're designed to last 50k miles, but actual lifespan can vary depending on driving conditions and car usage.
