MSD Smart Coil Big Wire Kits allows you to run dwell time over 5 milliseconds to gain the most performance from your MSD Smart Coils. They allow each coil to produce 50,000 peak voltage and a peak energy of 190 millijoules, for an extremely hot spark. This burns the maximum amount of fuel in each cylinder to deliver the highest potential horsepower from your engine and is especially useful for engines utilizing power adders. Learn more: https://www.holley.com/products/ignition/ignition_coils/rac