MSD 6AL-2 Black Ignition Box With Rev Limiter Ignition Control # MSD64213MSD 6AL 2 Black Ignition Box With Rev Limiter Ignition Control # MSD64213 MSD is excited to announce the next generation of 6 Series ignition controls the 6AL 2! The ignition control combines a new housing, new digital controls, and more power in a sleek package. Inside the new cast aluminum housing, you'll find an advanced micro controller that manages the built in two step rev limiter. The spark output of the new box has been turned up to 535 volts