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I don't think there are any appreciable power gains to be had with deleting your EGR, however you'll be removing a sometimes problematic part on these trucks so your reliability is bound to improve. As far as DPF deleting, power wise the possibilities are somewhat endless.
The delete itself wont gain you anything except for maybe some lower EGT's, but with the delete you have to run a tuner to tell the trucks computer to not s$%# the bed when it realizes it doesn't have a DPF filter on it. Your power gains will come with what type of tuner you select, and furthermore with the level of power you choose to have your truck tuned to.
You can delete the DPF, run a tuner, and still run stock power level but whats the fun in that? Most of the reputable tuners will allow you to add power reliably, but you have to be responsible (unless your pockets are deeper than mine for repairs).
Some of the best tuners are:
Spartan Phalanx DashDaQ (excellent tunes, lots of power if you want it, but no tune changes on the fly)
H&S Mini Maxx (also excellent tunes, ability to shift on the fly)
SCT Live Wire (ability to run tunes just like the above, however the screen or heads up display isn't very easy on the eyes. functionality is just fine though)
I personally run a Spartan on a 250hp tune, with a S&B intake, and Diamond Eye 4" Downpipe back exhaust and love it. Mileage is far better than stock, the power is incredible and you're improving the long term durability of your truck when you get rid of that emissions garbage!