MSD #8733 Two-Step Module Selector, Adjustable, 2-Step, Plastic, Black, Chevy, Pontiac, LS Engines, Each. M46-8733 Description: GM Performance fans will be geeked to learn about this direct plug-in 2-Step Launch Control. The unit is easy to install with factory style connectors for a splice-free installation. When youre staged, you can hold the pedal to the floor while the rpm stays at a consistent level producing consistent launches.