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After much research and debating, between all the different types of mufflers that are out there, I have to decided to go with a 3" CherryBomb glasspack!! My Ex is just to quiet as it sits right now, that big of a truck should have some kind of growl!!!
Have you done the y-pipe yet? Mine got a bit louder after I did that. Still thinking about swapping out the muffler though. (Yes, even though I want a diesel.)