Hold full boost through a long pull with a clean spark in every cylinder. The HKS 50003-M45HL set gives tuned four-cylinder engines four Super Fire Racing M45HL iridium plugs, heat range 9, in the HL type: 12 mm thread, 26.5 mm reach, 14 mm hex.
A 0.6 mm iridium alloy center electrode faces a short, platinum-tipped ground electrode, so the plug fires at lower voltage and lights the mixture under raised boost or compression. In slow traffic, the thermal edge and spark support gap burn off carbon before it fouls the tip. The short ground electrode resists vibration.
Made for engines whose stock plug is M12 long reach, 14 mm hex, heat range 8, this set runs one step colder.
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