New Spark Plug Kit Genuine the OEM Manufacturer! 674-2000 Compatible with Cummins 8.3L 8.9L CNG Engines Replaces 4955850 5473010

100% New Spark plug kit for CNG Engines Denso's Iridium Saver Plug Guarantees High Reliability for withstanding High Combustion Pressures by Incorporating a Stress Resistant Monolithic Resistor that Adheres to the Resistor Glass in the High Temperature Furnace. This Eliminates Interference to Electronic Equipment from High Energy Coil Noise. · Newly Developed Ceramics with Finer Grain, Molded in Higher Pressure and Higher Density Prevents Electrical Breakdown of Insulator · Special Nickel Plating with Better Corrosive Resistance for Condensed Acid Water · Denso's Unique Iridium Alloy Offers a High Welding Point which Dramatically Improves Wear Resistance Compared to other Iridium Plugs · 360° Laser Welding is Used to Create a Seal So Reliable the Electrode Resists Wear Even Under the Most Extreme Engine Conditions · 0.7mm Center Electrode Dramatically Improves Ignitability · Ideal Plug in High Compression Lean Burn Engines

• Kit includes 1 plug and 1 boot & Grease
• 1 year warranty