First I'd ask what coil are you going with? The ballast with the orange/chrome box kit is a nominal 1.25 ohms & the race ballast is a nominal .25 ohms. Actually you have a fair amount of leeway on how much ballast you use. I'd ohm the current one & post what you get & if using the same coil maybe trying to get pretty close to that ohm amount. FYI 2 single ballasts will fit side by side perfectly in the 4 terminal "dual" ballast connector(s), the one with the 2 white bakelite connectors, one on each end with the blue loop of wire on one end. If you add a blue loop on the other end it will in effect make em parallel which'll lower the ohms which may help you get where you want to be. The last 4 terminal ballast I checked had 6 ohms on one side & 1.6 ohms on the other side & when I made em parallel I got 1.1 which was pretty close to what I wanted with an OE black ECU/stock black coil