Bigger pipe can usually make for deeper, louder tones than smaller pipe. If you don't want to be totally ghetto by running open headers, you could do dual 2.5" straight pipe with turndowns. Be wicked loud outside AND inside. Or even go with dual 3" if you want to lose a lot of torque. I'd say go with the electrically-operated cut-outs (what Copperhead has). Flip the switch and be LOUD.
I got some vids of my old Dakota R/T that had a gutted 3" cat, 3" straight pipe to a Flowmaster 3 chamber with dual 2.5" out to Megs tips, centered under the roll pan shotgun-style if you want to hear what that is like.
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