If Ford put it on there, it's necessary  .
There are quite a few things that the PCM looks at when dealing with the backpressure sensor. I'd make sure it's clean.
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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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