Product Information
Fitment: This set of 4 NGK Laser Iridium spark plugs is designed for 2018 - 2021 Subaru WRX STI and 2006 Mitsubishi EVO 9. Features: Specifically engineered for original equipment (OE) applications. The trivalent metal plating offers excellent anti - corrosion and anti - seizing properties. Corrugated ribs stop flashover. The pure alumina silicate ceramic insulator provides great strength and efficient heat transfer. The copper core helps remove heat. Triple seals prevent leakage. With a longevity of 100k miles and a 60 - day manufacturer warranty. Spark Plug Shell: Thread diameter is 14mm, thread pitch is 1.25mm, seat type is flat, reach is 26.5mm (1.04'), wrench diameter is 5/8' (16mm), terminal type is solid, and gap is.024' (0.6mm). Center Electrode: The tip is made of iridium and the core is copper. Ground Electrode: Made of nickel, standard type, with a taper - cut shape. Specifications: It has a 5k Ohm resistor, a manufacturer heat range of 7, and torque specs of 18 - 25.3 lb. ft. for cast iron and 18 - 21.6 lb. ft. for aluminum. These spark plugs offer superior ignitability and a long service life. They have the smallest available iridium tip diameter for slow wear, stable idle, better anti - fouling, improved fuel efficiency, and lower emissions. Designed as an OEM - compliant replacement, they feature a laser - welded iridium tip and trivalent metal plating for faster starts and quicker acceleration. They come pre - gapped and don't need modification. Import Image Racing is an authorized NGK dealer, ensuring authentic products covered by the manufacturer warranty. California Prop 65 Warning: Operating, servicing, and maintaining vehicles can expose you to harmful chemicals. Minimize exposure by avoiding exhaust inhalation, idling only when necessary, servicing in a well - ventilated area, and washing hands often or wearing gloves.
Using these NGK Laser Iridium spark plugs is easy. First, make sure your engine is turned off and cooled down. Locate the spark plug ports in your 2018 - 2021 Subaru WRX STI or 2006 Mitsubishi EVO 9. Remove the old spark plugs carefully. Then, take one of these pre - gapped spark plugs and insert it into the port. Use a wrench with the appropriate size (5/8' or 16mm) to tighten it. For cast - iron engines, tighten to 18 - 25.3 lb. ft., and for aluminum engines, tighten to 18 - 21.6 lb. ft. Do this for all four spark plugs. When it comes to maintenance, keep an eye on your engine's performance. If you notice a rough idle, poor acceleration, or decreased fuel efficiency, it might be time to check the spark plugs. These spark plugs are designed to last 100k miles, but it's a good idea to inspect them periodically. Also, follow the California Prop 65 warning. Avoid breathing in exhaust, don't let the engine idle more than needed, service your vehicle in a well - ventilated area, and wash your hands often or wear gloves during servicing.
