I'm in Georgia and they have emissions testing
You are pretty much screwed, unless you want to restore the system to original each time you get it tested. You are either going to have to move, or register the truck elsewhere, or better yet sell it and buy a pre-emissions vehicle.
BTW it is a felony to remove any emissions stuff, though it is quite commonly done. I was considering a Ram 6.7, but I ended up with a very nice low miles 2006 Ram 3500 5.9, for this very reason. OTH any common rail (very high pressure) diesel engine is going to have issues running low quality fuel, but you can add extra filters and additives to take care of that.
Are you sure that Georgia will continue to test diesels? Here in Washington state, late model trucks (2007+) are exempt, and ALL testing will be phased out by 2020. Older diesels are also exempt, but only those under 6001 pounds GVW, so my heavy '06 will continue to get tested (opacity test), due to my zip code. If I moved five miles further out from Spokane, it would be exempt. What a stupid system....
John Davies
Spokane WA USA