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HKS Super Fire Racing spark plugs are high performance Iridium plugs designed to handle advanced levels of tuning and still offer easy start-up and smooth idling. By utilizing a 0.4mm diameter Iridium plug electrode core and a U-shaped grooved electrode, lower voltage is required for spark to occur. This delivers a stronger ignition spark, stable idle, and reduces the likelihood of misfire during high boost.
- S35i
- S40i
- S45i
