Ok there are 2 styles for the 700 a piggy back one and a stand alone. What is the difference beside the obvious. Is one better than the other? I dont know why you would need the piggy back unit it would just be one more thing that could fail. Then there is the programable one not sure I would need that not going into the motor. But have the monsters duals and gytr intake & filter and dyna tek fuel programer. And would the coil from them make any difference? Any help from you guys would be appreciated.