Dis-4 Plus Distributorless 4-Channel For Use On 6 Or 8-Cylinder Engines With Two, Three Or Four Coil Packs MSD IgnitionMSD's DIS 4 Ignition Control is designed for engines with coil pack, waste spark ignition systems and is capable of firing up to four coil packs (or even four individual coils). Each Control delivers full power Capacitive Discharge sparks from idle through racing rpm. Below 3,000 rpm there is a series of multiple sparks that last for up to 20 Degree of crankshaft rotation to improve idle, starting and throttle response. Spark. Other common