NGK Racing Spark Plugs R5671A-7/4091
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NGK Racing Spark Plugs R5671A-7/4091NGK V-Groove plugs are our favorite conventional spark plug for all performance applications. NGK's patented V-groove design allows an ignition system to spark easily in such dense air/fuel mixtures. The flame kernel grows rapidly and enables an engine to make more power because it's operating more efficiently. As a bonus, the spark's outer edge location helps limit the quenching effect, reducing misfires caused by high cylinder pressures blowing out the spark.
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