5" or 6"
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5in is nice but i would def go with the 6in. sounds amazing. i have seen and heard trucks with 12in stacks and they are WAY to big. they look goofy. take in to consideration, that stacks are extremely loud while your in the cab. it gets kind of annoying. i have a full 5in pipe from the turbo back with no muffler and a 6in tip. that sounds real good. not to noisy in the cab, but the person behind you will def. know it aint stock.
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