25. It’s always a good idea to compliment your MSD distributor with a support system engineered by the same company. You can hide the 6AL box behind the firewall, which protects it from heat and road debris. MSD ignition wires are custom cut so you can measure and fit them to your application. Remember, your factory ignition lead is a resistor wire and should not be used to power your MSD system. You want power direct from the ignition switch or via a ballast resistor if provided by MSD.