HKS 50003-M45XL M-Series Racing Spark Plug M45XL Heat Range 45

HKS 50003-M45XL M-Series Super Fire Racing Spark Plug (M45XL) 

Genuine HKS Super Fire Racing M-Series spark plug designed for stable ignition and durability in demanding, high-load performance applications. M-Series plugs feature HKS-specific anti-fouling and durability design elements for performance-oriented engines.

Part Number

• HKS: 50003-M45XL

• Model: M45XL (XL Type)

Key Features (per HKS M-Series)

• 0.6mm iridium alloy center electrode for focused spark energy and long service life

• Platinum-tipped ground electrode for improved durability

• Short-type / anti-vibration ground electrode design to help withstand harsh conditions

• Anti-fouling design features (Thermal Edge & Spark Support Gap) to help reduce carbon buildup

Specifications (M45XL)

• Heat Range: HKS 45

• Thread Size / Reach: 12mm x 26.5mm

• Hex / Wrench Size: 16mm

• Sold individually.

Please confirm fitment before purchase. Spark plug compatibility depends on your engine’s required thread/reach, seat type, heat range, and your tune/setup.

To verify fitment, match your application to these specs:

• 12mm thread

• 26.5mm reach

• 16mm hex

• HKS heat range 45

• Professional installation recommended

• Use proper torque and gap per your engine/tuner specifications