NGK Racing Competition Spark Plugs Set of 4 Projected StyleNote: R7437 9 and R7438 9 can be interchanged. R7438 9 is a non projected style plug and is normally recommend for extreme high performance racing use. Check with your tuner regarding gapping. Set of 4 racing competition spark plugs. These are iridium coated, but they are recommended to be changed at 15,000 to 25,000km intervals if you are using them for racing applications. These plugs are the highest performance plugs NGK make, and are recommended
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NGK Racing Competition Spark Plugs Set of 4 Projected Style