I've never heard of them (and been doing diesel performance for quite a while)
There are a bunch of reputable companies that make a chip for your truck:
Edge, Quadzilla, Mads (Smarty), Bully Dog, Banks (I don't recommend the last two)
However, if you turn up the power, they do that by modifying the fuel injection timing and duration, it will increase exhaust temps (increased timing can yeild better mileage to a point) but you will need gauges to keep an eye on your exhaust temps and transmission temps
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