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not really. all that the tubing diameter really changes is the spm at which it resonates and it will effect the pitch a little.
if you are worried about your V6 sounding liek crap i will save you a bunch of money and time right now, it is a V6, it will sound like ass, to avoid this find the most silencing muffler in history and put two of them on the car.
on the other hand if you actually want an exhaust system that will support some performance gain you may as well go 3inch. the engine already processes enough air to take advantage of it and it will only improve as you add other mods.
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