Multiple U.S. Warehouse LocationsBroken ApexFree shipping on qualified orders over $100*
The HKS Super Fire Racing M40 spark plug is a single plug from the Super Fire Racing family intended for applications matching the M40 specification. Sold individually, it serves as a direct replacement option for a single cylinder or partial set refresh. Select this plug when the M40 type is required to align ignition parts with engine tuning and service needs.
HKS SUPER FIRE RACING M40 - Single
