Smoke and mirrors.
Typical secondary ignition voltage required to "fire" the spark plug on most gasoline engines ranges from about 7K volts to 25K volts depending on load and fuel mixture.
Just because companies sell coils capable of 50K volts does not mean that you're getting 50K volts to the spark plug. If it only takes 15K to ionize the air in the plug gap, that's as much voltage as you're going to get....stock or aftermarket.
Now, if you're running super-high compression, forced induction, lean air/fuel ratios, or a really wide plug gap, your voltage requirements WILL increase. At this point, you may run into a voltage problem (MAY). On a stock truck, there's no sense wasting your money on something that will do nothing.
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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