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Message: <blockquote data-quote="NXcoupe" data-source="post: 1065891" data-attributes="member: 11751">This guy is right.  If you have a newer MAC cat back, the flow tubes bolt on.  If you have an older MAC exhaust, MAC makes the flow tubes separately for them, but the older systems had the flowtubes welded onto the mufflers.    MAC systems came in two ways over the years, either with the flow tubes welded onto the mufflers(old system), or the flowtubes have a ball on one end and a socket on the other, and it bolts to the muffler(new system, designed this way to allow smaller boxes and UPS shipping).  Good luck with it, call MAC in California and see if they'll sell that part to you separately.</blockquote>