2016-3-18 · 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.