This is the same ignition coil as Mototron AEM "smart" ignition coil The type of ignition coil you use on the build when you usually run after-market ECU. When the VAG coils do not have enougt power you use this instead. The coil gives up to 103mJ and at least 40000V, which is in class with most CDI systems. This is the first type of "smart" inductive ignition coils that provide a CDI-like spark with long spark duration necessary for overcharging. AEM?s High-Output, Insulated Gate Bipolar Transistor (IGBT) ?Smart? Inductive Coils are designed for use on applications that do not have an external igniter. AEM?s High-Output, Insulated Gate Bipolar Transistor (IGBT) ?Smart? Inductive Coils are designed for use on applications that do not have an external igniter. AEM?s High-Output IGBT ?Smart? Inductive Coils each deliver up to 103mJ of spark energy and a minimum of 40,000 Volts?as much as most CDI systems but without the need for a CDI module! These coils provide very long spark duration