E3 Power Sports spark plugs are a breakthrough in spark plug technology. Developed by researchers from leading engineering universities, E3's patented electrode design allows for a better spark, resulting in a more complete flame kernal and flame front extending off the electrode, which produces better overall localized pressure inside your boat, jetski, ATV, or snowmobile's engine's cylinder(s). This in turn leads to the fuel/air mixture injected into the cylinder being more cleanly consumed, decreasing the level of greenhouse gases emitted, increasing energy efficiency, and generating more horsepower.Expires Feb 12, 2011