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Duramaxtuner is who I'd recommend for emissions Intact tunes. Also you can data log to monitor what the truck is doing

Awesome just what I was hoping for. By logging you mean he gets his stock tune file without driving the vehicle correct?

Would it be easier if he got a blank Autocal and I just linked them together and tune that way? That way he can data log an we can email back an forth

So would this process work for example I live in Texas and want to tune my dad's lb7 in illinois. Would I just need his stock file then I can mess with it on a laptop and email it back to him?