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The only tubing is the piece that connects the m6 muffler to the rest of the 640 exhaust. The exhaust pipe from the m6 mufflers is alot larger than the 640 tubing .. other than that. That was it ..used same hangers and all .. charged 130 for install.. but that may be the reason y we non m6 guys mite b getting some droning ..simply because are exhaust are smaller circumference wise ...and possibly getting back pressure. Who knows lol ..I haven't closed the flaps yet to see if that helps
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