I'm trying to figure out which MSD Ignition coil to purchase. I already have the MSD 6A ignition. The two coils I am looking for are the Blaster II High Vibration Coil and the MSD TFI Blaster Coil. Obviously the first one is beneficial for all the offroading I do, but I read alot about TFI ignitions in Fords. How do I know if I have a TFI ignition or not? Does anyone know if the High Vibration Coil will work with a TFI ignition or if I have to stick with the TFI specific coil?

Thanks