Seller notes

HKS M Series Super Fire Racing Spark Plug for 2006-2007 Subaru WRX STI 50003-M35iL HKS M-Series Super Fire Racing spark plugs are high performance Iridium plugs designed to handle advanced levels of tuning and provide Improved ignition performance, durability and anti-carbon build-up. The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any lo...

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