Swapping to a coil - on - plug ignition set - up can eliminate dwell time issues that can be problematic in stock ignition systems, and AEM's Ignition Coil Drivers are the most affordable way to drive coils in a coil on plug set - up. AEM's Ignition Coil Drivers are designed for driving high - power, dwell - controlled two - wire (dumb) coils commonly found on performance engines. Our Three - and Four - Channel igniter coil versions can be used as a replacement for a stock coil driver or when converting to coil - on - plug in engines that do not need the extra spark energy from a CDI, or do not have the mounting space for a CDI like on ATVs, snowmobiles, motorcycles, and other Powersports applications.