HKS Super Fire Racing MR40XLB

This is the HKS Super Fire Racing spark plug, part number 50003-MR40XLB. It's a stock replacement ignition part designed for a wide range of vehicles. These spark plugs are built to handle demanding engine conditions, offering reliable ignition for your engine's combustion cycle.

The Super Fire Racing series uses a special iridium alloy for the center electrode and a platinum alloy for the ground electrode. This combination helps ensure a strong spark and improved durability, even under high-performance driving. The plug's construction is focused on delivering consistent performance and a long service life, making it a solid choice for maintaining your engine's ignition system.