The mid 1980s were the beginning of the end for distributors in regard to new cars. The Buick Grand Nationals started using coil pack technology while many other GM vehicles were using dual tower coil packs sometimes known as Waste Spark systems. When Ford moved to the 4.6L Modular engine in the ’96 Mustang, there were two coil packs with four towers each set up as a Waste Spark. Other common applications came from Mitsubishi and eventually Chrysler systems. MSD’s DIS Ignition Controls are designed for engines with coil pack, waste spark ignition systems. The DIS-2 has two channels, to fire two coil packs, while the DIS-4 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° of crankshaft rotation to improve idle, starting and throttle response. The adjustable features of the DIS Ignitions have also been upgraded with rotary dials. These provide easier, and more precise adjustments of the overrev limiter and the holeshot rev limit. Also, there is now a step retard that can be wired directly to a nitrous system or switch for activation! For use on 6 or 8-cylinder engines with two, three or four coil packs. Features Two Step Rev Control Step Retard LED Monitor Brand MSD C.A.R.B. EO # D-115-25 Category Ignition Color Red Connector Gender Male Connector Quantity 1 Current Draw  6.6 Amps at 10,000 RPM Emission Code 1 Grade Type Performance Height 2.2 IN Ignition Type Performance Length 9.5 IN Mount Type Surface Mount Mounting Hardware Included Yes Primary Voltage 460-480 Volts Product Type Ignition RPM Range 14,000 RPM with 14.4 Volts Secondary Voltage 40,000 Volts Spark Energy 105-115 mJ/spark Spark Series Duration 20 Degree Crankshaft Rotation Sub Category Control Modules Terminal Gender Male Female Terminal Quantity 5 Voltage Required 10-18 Volts, Negative Ground Warranty Manufacturer’s Limited 1 Year Warranty Weight and Size 4.5 lbs.,9.5″L x 4.5″W x 2.2″H Width 4.5 IN