eliminate ballast resistor when installing msd box?

The MSD instructions do say to bypass it. I doubt your loosing much power though. I had mine hooked up through the ballast resistor first and then ran accross where it said to bypass it so I did. Couldn't tell even the slightest difference in how it ran. There is one good point to bypassing it though, they are prone to fail. By bypassing it you've eliminated one possible fault in your car.