Denso Iridium Spark Plugs for '00-04 2.0L Focus Zetec/SVT/ST170 (box of 4)

Note: Spark plugs come pre-gapped. It is recommended that for every 50hp increase over stock power that the spark plugs be one heat range colder.

Iridium is 6 times harder, 8 times stronger, and has a melting point 1200 degrees higher than platinum. Put that into a harsh environment such as an engine piston chamber, and you have a spark plug that can resist wear much better than platinum. Additionally, the DENSO Iridium Power alloy is so durable; it allowed our engineers to produce the worlds smallest center electrode (.4mm) which reduces the voltage requirements, concentrating its sparking power. Also, its smaller size, combined with the tapered U-Groove ground electrode, allows more room for the flame kernel to develop and produce a more efficient combustion.