HKS 50003-M525RE-1 M-Series Super Fire Racing Iridium Spark Plug

The HKS M-Series Super Fire Racing Spark Plug M525RE-1 is a high-performance iridium spark plug designed for both heavily tuned engines and stock applications. Built for extreme racing conditions, this plug delivers superior ignition performance, enhanced durability, and excellent anti-carbon buildup properties.

Key Features:

• 0.6mm iridium alloy center electrode reduces voltage requirements and improves ignition efficiency
• Platinum chip outer electrode enhances durability and boosts ignition performance
• Heat range 10.5 (52.5) optimized for rotary and high-performance applications
• 14mm thread diameter with 21.5mm thread length
• 20.8mm width across hexagon flats for easy installation
• RE-type electrode design with shortened tip and tapered shape
• Nickel coating prevents premature deterioration
• High melting point of 2454°C withstands extreme compression and minor knock

The iridium alloy construction provides exceptional durability without sacrificing longevity, while the platinum-tipped outer electrode works in concert with the iridium center to deliver reliable ignition under high load conditions. Commonly used in Mazda rotary applications including RX-7 and RX-8, as well as Mazdaspeed and other high-performance vehicles.

Note: Sold individually. Made in Japan.