HKS Super Fire Racing Spark Plug MR45HLZ – High-Performance Iridium Plug for Turbocharged Engines

The HKS Super Fire Racing MR45HLZ is a premium, high-ignitability iridium spark plug engineered for high-performance and turbocharged engines operating under demanding combustion conditions. Designed to deliver stronger spark energy, improved ignition stability, and enhanced durability, the MR-series plugs are the preferred choice for tuned vehicles, high-boost applications, and engines requiring consistent combustion under extreme load.

HKS uses a fine 0.6 mm iridium center electrode paired with a heat-resistant nickel alloy ground strap to promote efficient flame propagation and reduce misfires. This design ensures reliable ignition even in engines using rich fuel mixtures, elevated boost levels, low-temperature plugs, and high cylinder pressures.

The MR45HLZ features a projected electrode design, optimizing combustion efficiency for modern high-speed and high-pressure engine platforms. Its construction is tuned to improve throttle response, reduce knock sensitivity, and maintain stable ignition timing—even at wide-open throttle and sustained high temperatures.

Built for longevity and consistency, the MR-series spark plugs undergo stringent quality control and thermal endurance testing to meet HKS’s racing-level reliability standards. Whether used on a daily-driven boosted car or a track setup that sees consistent high load, the MR45HLZ plug delivers the ignition performance required for safe, repeatable power.

Key Features

• Premium 0.6 mm iridium center electrode for strong, consistent spark

• Improved ignition efficiency under high load and boost

• Projected-tip design for enhanced combustion stability

• High-temperature nickel alloy ground strap for durability

• Ideal for turbocharged and high-performance engines

• Reduces misfires, improves response, and supports stable timing

• Reliable performance with ethanol, rich fuel mixtures, and high cylinder pressure

• Built to HKS racing standards for durability and heat resistance

Ideal For

• High-boost turbo engines

• Tuned platforms (Stage 1–Stage 3)

• Track and high-load environments

• Ethanol fueling (E30–E85)

• Drivers needing maximum ignition stability

Compatibility Notes

This plug is used across multiple Japanese and European high-performance engines, depending on heat range requirements.