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SCT with custom tunes is going to be your best bet for the 6.0 PSD. They don't have built in gauges so you will have to install some. SCT also tunes the tranny wich many others don't and when you are pulling that is very necessary or you will burn it up. ANY programmer or tuner WILL void your warrenty whether a dealer installed it or not. I have the Bullydog PMT with built in gauges and tons of options and love it, however I mostly just use stock mode. Once in awhile I will bump it up to tow(touchscreen shift on the fly) when pulling a good grade. But always watch the gauges. Do not let anyone talk you into the cold air intake,especially K&N. Not needed, the stock is good for up to 500HP. The biggest thing I would recommend first is a good 4" turbo back exhaust. See how you like the truck with that and then maybe a programmer. If your looking for better milage forget the programmer. It not enough to justify the cost of the add ons IMHO.
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