NGK Iridium IX High-Performance Spark Plug BKR9EIX | Heat Range 9

Unlock maximum ignition efficiency and throttle response with the NGK Iridium IX Spark Plug (Part No. BKR9EIX).

Designed specifically for the performance enthusiast, Iridium IX plugs feature an ultra-fine 0.6mm iridium center electrode. This advanced design ensures high durability and a consistently stable spark, even under extreme combustion pressures. The "9" heat range is significantly colder than factory standard plugs, making this the go-to choice for highly tuned, turbocharged, or supercharged engines (such as Stage 2+ Audi, VW, and BMW builds) where heat dissipation is critical to preventing pre-ignition.

Key Features & Benefits

• Ultra-Fine Iridium Tip: The 0.6mm laser-welded iridium center electrode reduces the voltage requirement for a spark, improving starts and acceleration.
• Colder Heat Range (9): Optimized for modified engines running higher boost levels to pull heat away from the combustion chamber faster.
• Trivalent Metal Plating: Provides superior anti-corrosion and anti-seizing properties, eliminating the need for anti-seize during installation.
• Tapered Cut Ground Electrode: Minimizes "quenching" effect for a more complete and powerful flame kernel.
• Superior Anti-Fouling: Advanced ceramic insulator prevents flashover and electrical leakage under high stress.

Technical Specifications

• Manufacturer: NGK (Made in Japan)
• Part Number: BKR9EIX
• Heat Range: 9 (Cold)
• Thread Diameter: 14 mm
• Thread Pitch: 1.25 mm
• Thread Length (Reach): 19 mm (3/4")
• Hex / Spanner Size: 16 mm (5/8")
• Gap: 0.8 mm (0.031")
• Center Electrode: Iridium Tip
• Ground Electrode: Tapered Cut

Common Applications

This "Heat Range 9" plug is a popular performance upgrade for modified European engines, including:

• Volkswagen/Audi: Highly tuned 1.8T, 2.0T TSI/TFSI (EA888/EA113) engines running aggressive Stage 2/3 software.
• BMW: Forced induction M50, M52, M54, and N54/N55 builds requiring a colder plug.
• Mitsubishi: Lancer Evolution IV-IX models.
• Subaru: High-boost Impreza WRX & STI builds.

⚠️ Fitment Note: This is a Performance / Racing grade colder spark plug. If your engine is completely stock, it may not be perfect choice, as a plug this cold may lead to carbon fouling in standard daily-driving conditions.

Reference Numbers & Cross-References