HE1HT9 Spark Plug (2 pack)Product Description Experience a new level of performance and efficiency with Pulstar spark plugs, featuring patented Plasmacore technology that was developed in collaboration with a US Department of Energy laboratory. These spark plugs use an internal capacitor to store energy; when released, an ultra high intensity electrical pulse saturates the fuel with combustion enhancing plasma, ensuring instantaneous ignition and the most rapid burn possible.