If you are referring to the exhaust braking using the turbo (not an actual exhaust brake mounted in the exhaust), I've been doing that for over 25k miles now. All my tunes have the feature, just to varying degrees depending on the application.
It won't damage the turbo, as the stock programming using the same feature (via engine breaking). It will slow the truck down when descending grades, particularly with tow/haul engaged. Takes a lot of load off the brakes.
Also it seems to shift really hard maybe it's normal but it's not as smooth shifting as before should I lower the shift pressure
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