HKS Super Fire Racing M Series spark plugs are high quality iridium alloy spark plugs designed to improve ignition performance in tuned and factory engines, increase durability and protect against carbon deposits.

They have anti-vibration properties and are ideal for advanced tuning levels.

The design of the spark plugs consists of:

0.6mm thick center electrode, which reduces voltage requirements, as well as provides durability and improved ignition.

An outer electrode with a platinum chip, which contributes to a long service life and improves ignition in conjunction with the central electrode. Thanks to the shortened tip, the necessary space for proper ignition is provided;

A short outer electrode, which reduces weight and provides an anti-vibration function and, accordingly, increases the service life;

Special thermal edge, which reduces the accumulation of carbon.

Plug Type: HL

Thread Size: 12x26.5

Wrench Size: 14

Heat Range: 9