You can't get the whole picture by using a multi-meter and measuring DC resistance. The coil is an AC device with the additional properties of reactance and impedance. You COULD use a scope and measure all of this. From Kayo's experience though we can conclude his combination isn't too bad. BTW not only could you shorten the life of the coil but you could also shorten the life of the ignition wires, spark plugs, and ECU. For the small (if any) gains that you could achieve I think (IMHO) instead of spending for the sometimes pricey "performance" parts just do a good tune-up more often and you would probably be way ahead. Putting a coil with a higher output on old wires and worn plugs is not the way to improve performance (again only my humble opinion). David Teitelbaum vin 10757 --- In dmcnews@xxxxxxxxxxxxxxx, "John Hervey" <john@xxxx> wrote: > Bill, The way the Pertronix is made, you could run it with straight voltage > and get more punch. My not last but 1 or 2 years instead of 4 or 5.