Ultra 6AL Plus Ignition Control, Red, With Start Retard, 3 Rev Limiters, Step Retard, USB, Timing Curves, Retard Timing, Programmable Launch Timing Curve, 4 Bar MAP Sensor, Rotary Dials Ultra 6AL Plus Ignition Control, Black, with Start Retard, 3 rev Limiters, Step Retard MSD 6 BTM Boost Timing Master Do I need a boost retard box for my blower setup to run the best? MSD 7762 Boost Retard Module For Power Grid Ignition Timing Controllers Laukkanen Motorsport MSD 6AL & MSD Boost Retard Pelican Parts Forums