These NGK Iridium spark plugs are a perfect fit for 2002 - 2005 Subaru WRX models. Sold as a set of 4, they offer many great features. The trivalent metal plating gives excellent anti - corrosion and anti - seizing performance. Corrugated ribs stop flashover. The pure alumina silicate ceramic insulator provides strong durability and efficient heat transfer. The copper core helps remove heat quickly. Triple seals prevent any leakage. With a lifespan of up to 50,000 miles and a 60 - day manufacturer warranty, you can trust these spark plugs. The spark plug has a 14mm thread diameter, 1.25mm thread pitch, flat seat type, 19mm reach, 16mm wrench diameter, solid terminal type, and a 0.8mm gap. The center electrode is made of iridium tip and copper core, while the ground electrode is nickel with a taper - cut shape. It has a 5k Ohm resistor and a manufacturer heat range of 6. Torque specs are 18 - 25.3 lb. ft. for cast iron and 18 - 21.6 lb. ft. for aluminum. NGK Iridium spark plugs are more durable than platinum ones, with a higher melting point, better anti - oxidation and anti - erosion of the center electrode, improved ignition, superior anti - fouling, and lower required voltage. A new metal shell plating process enhances anti - corrosion. For heavily modified cars, one - step colder plugs are recommended. These plugs can make your Turbo Subaru run smoother and boost power through increased efficiency and heat resistance. They come 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 may re - gap them, but be careful as slide - type plug gappers can damage the fragile iridium tip. Import Image Racing is an authorized NGK dealer, so your purchase is guaranteed to be authentic and covered by the manufacturer warranty.
Using these NGK spark plugs in your 2002 - 2005 Subaru WRX is straightforward. First, make sure your engine is cool. Then, carefully remove the old spark plugs using the appropriate wrench. Install the new NGK spark plugs, following the torque specs: 18 - 25.3 lb. ft. for cast - iron engines and 18 - 21.6 lb. ft. for aluminum engines. When it comes to maintenance, these spark plugs are designed to last up to 50,000 miles. However, it's a good idea to check them regularly for any signs of fouling or wear. If you notice misfiring or a decrease in engine performance, it might be time to take a closer look. Be very careful if you want to re - gap the spark plugs. Slide - type plug gappers can damage the iridium tip, so it's best to do this at your own risk. And remember, Import Image Racing is an authorized dealer, so you can trust the authenticity of your purchase and enjoy the 60 - day manufacturer warranty.
