80% under what the other stores charge
Compared across 13 stores. Prices are checked against each store and labelled with when.
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A set of four NGK Iridium IX spark plugs in heat range 7, one step colder than stock, sized for Subaru EJ25 turbo engines in the 2004+ STI and 2006-2014 WRX. The fine iridium center tip gives a stable, strong spark and resists fouling, and the trivalent metal plating helps against corrosion and seizing in the head. They suit tuned or higher-boost EJ25 builds that need a colder plug than the factory heat range. Compared with standard copper or platinum plugs, iridium lasts longer and holds up better under boost, but a colder plug is the wrong choice for a stock, lightly driven car.
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Lowest price we've seen: $9.16 on Nov 13 at Partsgeek.com. Tracked across 13 stores since Nov 13.
Owners of turbo Subarus fit these as a routine upgrade on tuned cars and report smooth idle and clean running. Some note that a colder plug fouls if the car is mostly stock or driven gently.
NGK Iridium IX spark plugs in a one-step-colder heat range, made for higher-horsepower Subaru EJ25 turbo engines. They are sold as a set of four.
Each plug has a fine iridium tip. The iridium alloy has a very high melting point, which gives a stable spark and durability. Trivalent metal plating resists corrosion and seizing.
The plugs are designed for extreme ignitability, improved throttle response and resistance to fouling for consistent ignition.
