Differences Between MSD 6-Series Ignition Control Boxes Performance System

Differences Between MSD 6-Series Ignition Control Boxes Performance System Digital 6A: Base model with multiple sparking, capacitive discharge (CD) ignition control. Hotter Spark for Improved Driveability Without Rev Limiter - Can Not Be Added Digital 6AL: Digital 6AL or 6BTM Ignitions are made for spirited driving, grabbing gears or some form of racing. Includes Adjustable Soft Touch Rev Control Can Add a 2-Step Module Selector for Launch rpm Limit Digital 6AL-2: Ideal for the street and strip applications. Includes Built-in 2-Step Rev Control Digital 6 Plus: Ideal for 4, 6 and 8-cylinder engine applications. Includes Built-in Drag Race Features, 2-Step Rev Control, Single Stage Retard and Start Retard Programmable 6AL-2: Provides PC programming for the street. Extreme Duty 6ALN: For severe duty applications such as off-road truck racing or saturday night dirt tracks, Sealed locking connectors and epoxy for vibration resis