NGK Iridium Spark Plugs Heat Range #6Heat Range: 6 (Stock) Why NGK Iridium? More Durability and a Higher Melting Point compared to Platinum, better center electrode anti oxidation and anti erosion, improved ignition, superior anti fouling, lower required voltage, new metal shell plating process for better anti corrosion. One Step Colder plugs are reccomended for cars with heavy modifications. These NGK plugs will get your Turbo Subaru running smoother and free up some power through
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