NGK Iridium Spark Plugs Heat Range #7SUBARU OWNERS: NOTE IF YOU HAVE A 2. 5 LITRE BLOCK AND USING 2. 0 LITRE HEADS USE NGK BKR7IEX Heat Range: 7 (1 Step Colder than 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
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