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Theres alot of peoples using 1 5/8 tubing size ex.bbk.
I personally use 1 3/4 but most peoples wont need to go pass 5/8th. Theres an old saying that the bigger the piping you will lose more tq but gain top end and vice versa. SS did a test with different piping size from 5/8th to 2" and surprisingly 2" made the most power.
I think with our v6 you wont notice any difference so pick one.
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