Just a thought but what would it cost to have a shop bend you up a new system, useing the old cat, but say just with a new Flowmaster muffler? It might sound cool. If it were me I'd just eliminate the center muffler, you can alwalys install one later if you don't like the sound.

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2006 CL500
1969 280SE
2023 Ram 1500
2026 Genesis GV70
2007 Tiara 3200