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MP boxes seem to live longer with either a high resistance coil or a coil/ resistor combination of 1.4 ohms or more.
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If you have ~1.5 ohms total (coil+ballast) on an std ECU setup (not msd/not CD) then you'll be fine
Both good answers. People that say the resistor protects the coil are half right. It also protects the transistor on the ecu from overload. Obviously from this and many previous threads some people have successfully used much lower resistance without failure but not everyone will be that lucky. Years ago I played around with high tech heatsinks on the transistor(my cousin was making heatsinks for NASA). It was probably effective but not really worth the insignificant gain from running a lower ohm resistor than originally intended.
In theory, there is no difference between theory and practice. In practice, there is.
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