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I just installed a 3" x-pipe system on my 73 cuda. 383 with tti headers and dynomax mufflers. Had some similar issues. I just hosed all the slip joints down with white lithium grease and it helped ALOT! Let all those joints move in and out and twist around. At first I was ready to give up and take it to a muffler shop and have them modify it. All the pieces have the part numbers on them so I would double check them with the install sheet.

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Yes the pipes have numbers that you match up on each end, there's no guessing what goes where and then it will fit correctly. They are very small and a lot guys don't know their there. Match the same number on each end and you will know for sure if you have it together right.

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