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It is a lot of personal opinion, my suggestion is to get on youtube and just look up v6 exhaust. Plenty of videos...
After you find some you like try to find out what set up they have, and then go check some more videos out of that particular setup or something close to it.
Well in some instances, like an offroad mid pipe, performance and sound come together. I highly suggest a nice mid pipe. If not though, flows are good from what I've heard.