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i have the flowmaster suv40 on my durango with the 5.2 and it sounds good at idle but when you give it gas it sounds like the OEM muffler. glasspacks give a good growl through out the RPM range.
I have a 98 5.2 with borla cat cack system. Sorry, not sure of the muffler number for a 4.7. It has a very nice tone, not loud, but noticeable, especially if you put your right foot into it.