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I'm told 2.5" pipes in place of the 2.25" will sound like rice and you will lose some bottom end torque to gain 0-2 hp on the top end. I guess on the v6 bigger is not better over 2.25", at least at our power levels. If you do it you then have to control any bad sounds with the right muffler and maybe a resonated x pipe. Might as well get a system already designed for what you are looking for instead of backyard engineering thats all guesswork. I did magnaflow 14" mufflers for a deeper tone, left the 2.25" back pipes alone and got drone inside the cabin from the free flowing mufflers. Did resonated x pipe and killed most of the drone. Now sound deep and smooth and even better after my modded airaid box. This wasn't a kit so I relied on the mfg's knowledge, sound bites and my muffler shop owner's 30 years experience. Worked out pretty well.
Hope this helps somewhat
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