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The MSD ignition uses a different way of firing the coil. With a stock ignition, the coil is wired to 12 volt power, and the PCM connects to the ground wire. The PCM turns on the ground to build up a magnetic field in the coil, then turns the ground off and the energy in the magnetic field creates a spark. The MSD box stores energy in a capacitor and then dumps it into the coil. This makes for a hot, but very short, spark. (Which is why it makes a bunch of sparks at low RPM - the stock system uses one significantly longer spark.)

So the MSD box doesn't really override your timing settings (well, the basic 6A doesn't, you can get ones that do). It does have a bit more energy than stock, especially at high RPM. It doesn't have a huge benefit on a nearly stock engine, but if you're making significantly more cylinder pressure or RPM than stock, it could help. And if it's working fine now, I don't see any pressing reason to remove it.
 
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