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You can basically do whatever you want. if you feel like breaking apart the cat then all means go for it. As for the piping....if your doing custom go with 2.5" piping all the way back until it hits the muffler and then put that on. If your going for aftermarket then its made to go from the cat back.
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2004 Sonic Blue Ford Ranger XLT
2001 Liquid Grey Metallic Ford Focus ZX3
1995 Integra GS-R - Parting out
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