MSD doesn't do anything to the coils....
MSD stands for Multiple Spark Discharge...I will do this to my next Supra,
MSD means that where your spark plug usually fires one time it now can fire multiple times per revolution of the engine....it increases not only power, but the amount of gas burned per firing of the plug...That can also reduce emissions, seeing as how more of the atomized fuel is being burned.
any way that is just my two cents...:biglaugh: