HKS SUPER FIRE RACING M40- Pack of 10 Spark Plugs

The HKS M40XL Super Fire Racing Iridium+Platinum Spark Plug is designed for performance vehicles with custom tunes. It features an iridium alloy center electrode that reduces voltage requirements while improving ignition performance and durability. The outer electrode is equipped with a platinum chip that also aids ignition performance and has been shortened into an ideal anti-vibration shape for increased longevity. The thermal edge of the ceramic insulator helps decrease carbon deposits that can build up after long idles or other conditions. The M-Series is recommended for reliable ignition, durability, and anti-carbon buildup under high load.