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What I did was remove the muffler and welded in a Thrush Welded Muffler in its place. I also removed the cat and welded in a glasspack in its place. Sounds great! Love the sound of my 3.9.
i had my exhaust redone about a month ago i removed the cat and put in a flowmaster offf brand 50 series dualed out in front of both tires makes the 3.9 sound almost like a v8