To whom it may concern, please read the above posted mod throughly  befor replying the double coil system dose not increase voltage it keeps the voltage constant through out the rpm band. If you where to put a meter on the coil and run the car  at high speed you would' see that as you  accelerate your voltage would drop thus limiting your upper  end power.Many english and german top end cars employ  this system so that they can sustain high speeds  for long periods of time. I dont konw about you, but everyone can not afford an MSD or like wise system this is purely ment to be a mod for the working man. Addtionally,this will not hurt the igniter box or any other part of your ignition system for i have this system not just only on my starion but also on my trooper.