Powermadd E3 Spark Plug - E3.31 E3.31 All-new plug design features a unique electrode shape that maximizes the power created by the spark plug - Diamond Fire technology Electrode is a combination of performance and new technology that results in an improved flame kernel shape This flame front ignites the bulk air/fuel mixture faster, moves heat into the combustion chamber faster and creates a more localized pressure front for faster pressure rise during the cylinderpower stroke