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

Fits Most Chrysler/Dodge/Jeep 5.7L Hemi (03-08)

2313

NGK 1-Step Colder Iridium Spark Plugs are engineered for high-stress performance builds running forced induction or nitrous. The colder heat range helps combat excessive combustion temperatures created under boost, reducing the chance of pre-ignition and detonation while maintaining ignition stability. A fine 0.6mm iridium center electrode offers superior spark concentration and consistent flame kernel growth even under high cylinder pressure. With a copper core for efficient heat transfer, alumina ceramic insulator for strength, and trivalent metal plating to prevent corrosion and seizing, these plugs are built for long-term reliability. Triple-seal construction ensures leak-free performance, while the extended projection design enhances combustion efficiency. Perfect for aggressive tuning, racing setups, and high-HP boosted builds.

• 1-Step Colder Heat Range ideal for boosted and nitrous systems
• Fine-Wire 0.6mm Iridium Electrode for maximum spark efficiency
• Copper Core & Ceramic Insulator enhance heat management and durability
• Extended Projection Tip supports efficient ignition and cleaner burn
• Triple-Sealed Construction prevents combustion gas leaks
• Anti-corrosion Trivalent Plating resists seizing and wear
• Resistor Design (5k Ohm) for reduced electrical interference
• Tapered Seat Design with 14mm thread and 1.25mm pitch
• Gap: .043” (1.1mm) | Heat Range: 4

Torque Specs:

• Cast Iron: 10.8–18 lb-ft
• Aluminum: 7.2–14.5 lb-ft
• Longevity: ~50,000 miles (may vary with performance use)
• Quantity: Sold individually

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.