The 6AL delivers everything the 6A does with the addition of a built-in Soft Touch Rev Control. This feature allows you to set an rpm limit to protect the engine from over-rev damage caused by driveline failure or missed shifts. Other MSD RPM Controls can be connected to the 6AL such as a Three Step Module Selector (PN 8737) or RPM Activated Switch (PN 8950). The 6AL also comes supplied with rubber shock mounts and 3,000, 6,000, 7,000 and 8,000 rpm modules.