I would suggest you are careful with aftermarket lift pumps. I have never put an airdog on, but I have put some fass pumps on the 6.7's with terrible results.
According to spencer at Fass the pumps draw excess fuel and create a vacumn, they starve the system for fuel and will shut the truck down with a no restart condition. He also told me at this point in time they do not have a solution.
The factory lift pump is very capable from my experience, in fact i am still using it on my 6.7. I do however have a nice filter relocate kit, that uses a 2 micron filter. The filter mounts on the frame rail and is a cat ir-749 or equivalent. I use a fleetguard bracket and filter head and mounted the filter on the frame by the filler neck. The filter incorporates a water separator in the bottom and can be changed in 60 seconds at about a 12 dollar cost.
This is just my .02 cents and my experience I hope it helps.
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