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x pipe catted x pipe

  1. 2011 - 2014 Mustang GT and Boss 302
    I searched a little bit and didn't return anything. I think this has been discussed in a few threads, but none of which I remember the name to. I know that adding an X Pipe is a huge performance bolt-on. Second to only a tune more than likely, but my questions are as follows: 1. How good...
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