FAST E6 Digital CD ignition and coil kits are engineered to provide a solution for a digital electronic CD ignition that would work with FAST EFI components. The ignition box and coil are electronically matched together to ensure optimum performance and durability. The system includes multiple-spark functionality, meaning the engine will fire multiple sparks per cylinder while the engine is below 3,000 rpm. This feature provides a more complete burning of the fuel in the combustion chamber, resulting in a smoother running engine and better fuel economy. Ignition boxes are electronic fuel injection friendly--and specifically designed to work with FAST XFI, XFI Sportsman, EZ-EFI and EZ-EFI 2.0 systems. The engineers at FAST also designed the FAST E6 Digital CD ignition and coil kits to be fully compatible with all carbureted applications.