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I think the general consensus is do not use de-fueling. I am on a stock truck, stock studs, etc., with a rather mild advance and no de-fueling and it has been working pretty well. On deleted trucks the post main injection events are simply shut off, as they are only used for Nox and DPF regen. The pre-main events are supposedly simply to make the engine quieter. But I am quite the amateur in this question, so I am just as curious about it as you are. Myself, I'm simply looking for mileage, longevity, and no smoke. I don't really notice much in the way of performance gain unless I am accelerating with a lot of pedal, then it's quite a difference. And my fuel mileage is significantly better.
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