This is what I found when researching that question. "According to MSD(this is not me making this stuff up) the Mopar boxes are not internally regulated and need to have a total resistance (coil primary + ballast) of at least 1.5 ohms. The Blaster2 coil has .7 ohms of primary resistance and comes with a .8 ohm resister for a total of 1.5 ohms." Given that, you would remove the original ballast resistor and install the MSD .8 ohm ballast. The MSD ballast is a 2 pin.