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Yes, you should run a ballast with the OEM coil as well as most aftermarket coils. If you don't run it, the life of the coil will be greatly reduced as it will run much hotter and with nothing to limit current going to it.

FWIW, I tried to run my MSD Blaster II coil (Mopar chrome box ECU) with no ballast and it was searing hot after 5 minutes. I went to a .25 ohm ballast which dropped the voltage to the coil to 7-8V which kept it much cooler and with no discernable drop in output to the plugs (40-45kV).

Use the ballast.



You have other issues. Ecu should not be getting hot. Also my coil does not run hot.



My coil was running hot, not the ECU.