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As shown in the assembly manual [NC8] the RH rear chambered muffler was welded to its tailpipe. The LH rear muffler used a conventional tail pipe secured with a U clamp. Each muffler had 2 tabs and were bolted together.
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There is an original GM chambered system on ebay right now that shows that very setup.
http://cgi.ebay.com/ebaymotors/ws/eB...tem=4520947137
Rick H.