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Unless you go with something like 3" true duals you wont notice any power difference by doing it. Mine is 2.5" and I think my torque actually increased, I would run true duals (make sure to use either an X or an H-pipe) and see if that is loud enough for you before I started messing with the cats. If its not then you can always do the cats later, my truck is extremely loud in the cab and outside and my cats are the stock 2. You can check out my sig for an idea on how it will sound.
BTW It will depend on your dealer, but changing the cats could very well void your warranty, so I would check with them before I did that with a brand new truck.
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