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Cat back or axle back?
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05-22-2013, 05:43 PM
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Camper
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Drives: 10' 2SS LS3 M6
Join Date: May 2012
Location: Phoenix,AZ
Posts: 1,370
the power gains to be had at simple bolt on level is hiflow cats or removal of cats. the 2.5 pipe size is fine and really isnt in need of upgrading until you start pushing real power.
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