To help drag racers achieve even more consistently, MSD's engineers have incorporated an adjustable low rpm stage into a Three Step Module Selector. This allows you to make adjustments in 100 rpm increments from the drivers seat. The Launch Control Module features a shielded harness for increased protection against EMI so it can be mounted within easy reach of the driver. This way, as track conditions change while you're waiting in the staging lanes you can easily compensate the launch rpm. The Launch Control also features two other rpm limits; one for top end overrev protection and another to use during the burnout to achieve consistent tire temperatures. These limits are adjustable with MSD's plug-in modules. No rpm modules are supplied.