NGK 1-Step Colder Iridium Spark Plugs (Supercharged or Nitrous)

09-25 Chrysler / Dodge / Ram / Jeep 5.7L Hemi

LFR6AIX

NGK 1-Step Colder Iridium Spark Plugs are built specifically for high-boost and nitrous performance systems, offering precise, reliable ignition under extreme cylinder pressures and elevated combustion temperatures. Designed for serious performance builds, these IX-series plugs promote efficient burn and knock resistance, helping protect your engine during aggressive tuning and boosted operation. The ultra-fine 0.6mm iridium center electrode provides a consistent spark and fast flame travel, supporting efficient combustion even under demanding load. A copper core, pure alumina ceramic insulator, and advanced plating ensure optimal heat transfer, corrosion resistance, and long-term durability. With triple seals and taper-cut ground electrode design, these plugs deliver dependable performance and extended service life in high-stress environments.

• 1-Step Colder Heat Range — optimized for forced-induction and nitrous setups
• Fine-Wire 0.6mm Iridium Electrode for strong, stable spark and improved ignition efficiency
• Copper Core + Ceramic Insulator for superior heat control and detonation reduction
• Triple-Seal Construction prevents leakage and supports long-term durability
• Corrosion-Resistant Trivalent Plating prevents galling and seizing
• Projected Tip & Taper-Cut Ground Electrode for efficient flame propagation
• Resistor Design (5k Ohm) minimizes electrical interference
• Longevity: ~50,000 miles (dependent on performance use and conditions)

Torque Specs:

• Cast Iron Heads: 18–25.3 lb-ft
• Aluminum Heads: 18–21.6 lb-ft

NGK is one of the most trusted names in ignition, supplying spark plugs, coils, and related ignition/sensor components used across both OEM and aftermarket applications. For performance enthusiasts, NGK’s plug technology and broad coverage make it a reliable baseline upgrade for consistent spark, cleaner burn, and dependable operation under heat and boost.