Champion RE14WMPB4 (9403) Iridium Replacement Spark Plug, (Pack of 1) Optimal Performance: Fine-wire Iridium center electrode and platinum ground deliver maximum life Exclusive Heat-Active Alloy: Allows electrodes to reach optimal temperature quickly and remain stable under all engine loads Works with Any Engine Type: Greatest engine performance regardless of engine type or ignition system Maximum Power: With faster throttle response and focused spark Compatible with the Following Applications: Chrysler, Dodge, Jeep Focused spark for maximum power Exclusive Heat-Active alloy maintains stable operating temperature under all load conditions Faster throttle response