The MSD coils I have heard are used in FI applications. They help burn off extra fuel as they are multiple spark per singal.
I can't vouch if they will make your MPG go up or whatever because I went to an extremely cold plug at the same time for nitrous. I didn't loose any MPG though you think I would with a plug like that.
I was dumping fuel in on nitrous runs and the plugs looked great.
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