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I think most will agree with this and you dont ahve to do it in any particular order.
Intake- lots of people do the DIY 6637 filter, if you search for it you will find it. I did this and i like it, can hear your turbo scream but also still quiet when cruising.
Exhaust- Just get a muffler delete kit and also a cat delete kit if you have one, or you can spend around $300 and get a full 4" or 5" turbo back system, Only differences between sizing is the sound/tone of your exhauset, Unless your pushing around 400+ HP our factory 3.5" is suffecient enough.
Guages- these are a must if you plan to chip it, tow or a lot of heavy footed driving. Monitoring your EGT's, tranny temp (if its auto) and Turbo boost will let you know how your truck should run and will let you know when something is not working properly. Also when you chip a diesel your EGS will rise significantly to where you need to monitor them when hauling and when goin up long steep grades.
I would say after that then you should get your chip, DP i hear is good along with Beans, PHP and swamps. There are others out there so lookaround and see what people say about theirs and then make your decision based on your driving style. But in the end they are all very similar and will make you grin in your seat like a 5 year old on Christmas!
Hope this info helps.