interesting car craft article this month on GM modules

66plyValiant said

from what I've heard and seen its the mopar coil that can't handle full voltage; only HEI coil can give full spark voltage and be reliable

the mopar ECU doesn't require the ballast, if you look at the wiring diagram the ballast limits voltage before it goes to the coil; the ECU controls the negative for the coil

Click to expand...

I don't know where you get this

GM HEI modulates the current to the coil, that is, current limiting. The Mopar box does not. I'm not talking here about the switching action which actually controls the spark formation.

Both boxes "control" the negative to the coil, IE switch the negative. This is NOT the same as "current limiting"

There is NO doubt that removing the ballast from a Mopar system will result in damage or failures if driven on the street "long enough"

There is NO doubt that even with a factory Mopar coil, hotter output results with an HEI module and no resistor.